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0027048485
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2
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0027437887
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(b) Rosen, T.; Seeger, T. F.; McLean, S.; Desai, M. C.; Guarino, K. J.; Bryce, D.; Pratt, K.; Heym, J.; Chalabi, P. M.; Windels, J. H.; Roth, R. W. J. Med. Chem. 1993, 36, 3197.
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Roth, R.W.11
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3
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0027186206
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For synthesis of racemic 1, see: c
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6444238793
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For syntheses of ent-1 and ent-2, see: (i) Lemire, A.; Grenon, M.; Pourashraf, M.; Charette, A. B. Org. Lett. 2004, 6, 3517.
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For syntheses of ent-1 and ent-2, see: (i) Lemire, A.; Grenon, M.; Pourashraf, M.; Charette, A. B. Org. Lett. 2004, 6, 3517.
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33846546063
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(a) Baker, R.; Harrison, T.; Swain, C. J.; Williams, B. J. Eur. Patent, 0528495A1, 1993.
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0037467858
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For the synthesis of racemic 2, see: (d) Bhaskar, G.; Rao, B. V. Tetrahedron Lett. 2003, 44, 915.
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For the synthesis of racemic 2, see: (d) Bhaskar, G.; Rao, B. V. Tetrahedron Lett. 2003, 44, 915.
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15
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11844294912
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0344980248
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For the synthesis of 14, see: Stadler, H.; Bös, M. Heterocycles 1999, 51, 1067.
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(f) For the synthesis of 14, see: Stadler, H.; Bös, M. Heterocycles 1999, 51, 1067.
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17
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0035801823
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For the synthesis of deprotected 14, see: (g) Lee, J.; Hoang, T.; Lewis, S.; Weissman, S. A.; Askin, D.; Volante, R. P.; Reider, P. J. Tetrahedron Lett. 2001, 42, 6223.
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For the synthesis of deprotected 14, see: (g) Lee, J.; Hoang, T.; Lewis, S.; Weissman, S. A.; Askin, D.; Volante, R. P.; Reider, P. J. Tetrahedron Lett. 2001, 42, 6223.
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For a review, see: Datar, P.; Srivastava, S.; Coutinho, E.; Govil, G. Curr. Top. Med. Chem. 2004, 4, 75.
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(a) For a review, see: Takeuchi, Y.; Harayama, T. J. Synth. Org. Chem., Jpn. 2001, 59, 569.
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For recent syntheses of 3 and/or 4, see: (b) Kobayashi, S.; Ueno, M.; Suzuki, R.; Ishitani, H. Tetrahedron Lett. 1999, 40, 2175.
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For recent syntheses of 3 and/or 4, see: (b) Kobayashi, S.; Ueno, M.; Suzuki, R.; Ishitani, H. Tetrahedron Lett. 1999, 40, 2175.
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22
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(e) Takeuchi, Y.; Hattori, M.; Abe, H.; Harayama, T. Synthesis 1999, 1814.
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(i) Takeuchi, Y.; Azuma, K.; Takakura, K.; Abe, H.; Kim, H.-S.; Wataya, Y.; Harayama, T. Tetrahedron 2001, 57, 1213.
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(m) Sugiura, M.; Hagio, H.; Hirabayashi, R.; Kobayashi, S. J. Am. Chem. Soc. 2001, 123, 12510.
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Sugiura, M.1
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(o) Katoh, M.; Matsune, R.; Nagase, H.; Honda, T. Tetrahedron Lett. 2004, 45, 6221.
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Katoh, M.1
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(q) Takeuchi, Y.; Oshige, M.; Azuma, K.; Abe, H.; Harayama, T. Chem. Pharm. Bull. 2005, 53, 868.
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Takeuchi, Y.1
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Abe, H.4
Harayama, T.5
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38
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0026353381
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The enantiomeric purity of 5 was determined to be >99% ee by HPLC [CHIRALCEL OD-H; hexane-i-PrOH, 9:1; λ, 220 nm; flow rate: 0.8 mL/min; tR(5, 6.36 min; tR(ent-5, 8.71 min, c) Compound 5 was also prepared from (S, )-phenylglycine. See: Denis J.-N, Correa A, Greene A. E, J. Org. Chem, 1991, 56: 6939; Greene and co-workers reported therein that 5 was obtained in moderate yield with complete retention of enantiomeric purity by the addition of the crude Swern-oxidation product of N-Boc phenylglycinol to a large excess of vinylmagnesium bromide. Bhaskar et al. adopted this method for the preparation of compound 5 in their synthesis of 2,2d whose enantiomeric purity can be estimated below 50% ee in comparison with our own data. Ham and co-workers also synthesized 2 via an oxazoline derivative starting from N-benzoyl phenylglycinol.2e The optical rotation o
-
2e The optical rotation of 2 was in agreement with that reported in ref. 2d. These observations clearly imply that special care is required for employing easily racemizable phenylglycinal derivatives as a source of chiron approach.
-
-
-
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40
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33845281449
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For preparation of 1,2-amino alcohol arrays from vinyl epoxides or 1,3-amino alcohol arrays from 4-pentene-1,3-diol carbonates via the intramolecular reaction of a nitrogen-containing nucleophile with a π-allylpalladium complex, see: a
-
For preparation of 1,2-amino alcohol arrays from vinyl epoxides or 1,3-amino alcohol arrays from 4-pentene-1,3-diol carbonates via the intramolecular reaction of a nitrogen-containing nucleophile with a π-allylpalladium complex, see: (a) Trost, B. M.; Sudhakar, A. R. J. Am. Chem. Soc. 1987, 109, 3792.
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Trost, B.M.1
Sudhakar, A.R.2
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0028328337
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(c) Bando, T.; Harayama, H.; Fukazawa, Y.; Shiro, M.; Fugami, K.; Tanaka, S.; Tamaru, Y. J. Org. Chem. 1994, 59, 1465.
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Bando, T.1
Harayama, H.2
Fukazawa, Y.3
Shiro, M.4
Fugami, K.5
Tanaka, S.6
Tamaru, Y.7
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43
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0033555202
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For preparation of 1,2-diamine arrays from 5-vinyloxazolidinones via intermolecular reaction of a nitrogen-containing nucleophile with a π-allylpalladium complex, see: a
-
For preparation of 1,2-diamine arrays from 5-vinyloxazolidinones via intermolecular reaction of a nitrogen-containing nucleophile with a π-allylpalladium complex, see: (a) Cook, G. R.; Shanker, P. S.; Pararajasingham, K. Angew. Chem. Int. Ed. 1999, 38, 110.
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Angew. Chem. Int. Ed
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Cook, G.R.1
Shanker, P.S.2
Pararajasingham, K.3
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45
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0037473527
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(c) Cook, G. R.; Yu, H.; Sankaranarayanan, S.; Shanker, P. S. J. Am. Chem. Soc. 2003, 125, 5115.
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J. Am. Chem. Soc
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Cook, G.R.1
Yu, H.2
Sankaranarayanan, S.3
Shanker, P.S.4
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46
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33846499024
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In our preliminary investigation, DMSO was proven to be more effective solvent than toluene, THF and DMF. In addition, we found that DBU, soluble in above solvents, was much superior to other bases such as NaH, t-BuOK and Cs2CO3
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3.
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47
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33748574199
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(a) Dunn, P. J.; Häner, R.; Rapoport, H. J. Org. Chem. 1990, 55, 5017.
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Dunn, P.J.1
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Rapoport, H.3
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48
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0035801908
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(b) Seo, R.; Ishizuka, T.; Abdel-Aziz, A. A.-M.; Kunieda, T. Tetrahedron Lett. 2001, 42, 6353.
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Seo, R.1
Ishizuka, T.2
Abdel-Aziz, A.A.-M.3
Kunieda, T.4
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49
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0035801822
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(c) Katahira, T.; Ishizuka, T.; Matsunaga, H.; Kunieda, T. Tetrahedron Lett. 2001, 42, 6319.
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Tetrahedron Lett
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, pp. 6319
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Katahira, T.1
Ishizuka, T.2
Matsunaga, H.3
Kunieda, T.4
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50
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33846474210
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The reaction under heating at refluxing temperature in a flask overnight provided 4-phenyl-4-(3-aminopropionamido)-3-tosylamino-1-butene as the sole product
-
The reaction under heating at refluxing temperature in a flask overnight provided 4-phenyl-4-(3-aminopropionamido)-3-tosylamino-1-butene as the sole product.
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51
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33846560198
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After removal ofethylenediamine in vacuo, a mixture of the mono-N-Ts-protected 1,2-diamine and 2-imidazolidone was afforded, which was subjected to the next step without further purification.
-
After removal ofethylenediamine in vacuo, a mixture of the mono-N-Ts-protected 1,2-diamine and 2-imidazolidone was afforded, which was subjected to the next step without further purification.
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52
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0035157151
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For recent reviews, see: a
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For recent reviews, see: (a) Breit, B.; Seiche, W. Synthesis 2001, 1.
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(2001)
Synthesis
, pp. 1
-
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Breit, B.1
Seiche, W.2
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54
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0028827119
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For syntheses of piperidines through Rh-catalyzed hydroformylation, see: c
-
For syntheses of piperidines through Rh-catalyzed hydroformylation, see: (c) Ojima, I.; Tzamarioudaki, M.; Eguchi, M. J. Org. Chem. 1995, 60, 7078.
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(1995)
J. Org. Chem
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Ojima, I.1
Tzamarioudaki, M.2
Eguchi, M.3
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55
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0032565931
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(d) Ojima, I.; Iula, D. M.; Tzamarioudaki, M. Tetrahedron Lett. 1998, 39, 4599.
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Ojima, I.1
Iula, D.M.2
Tzamarioudaki, M.3
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57
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3,3′-di-tert-Butyl-2′-(diphenoxymethoxy)-5, 5′-dimethoxybiphenyl-2-yl]oxy}dibenzo[d,f][1,3]dioxepine, a) Billig, E, Abatjoglou, A. G, Bryant, D. R. U. S. Patent, 4668651, 1987
-
{[3,3′-di-tert-Butyl-2′-(diphenoxymethoxy)-5, 5′-dimethoxybiphenyl-2-yl]oxy}dibenzo[d,f][1,3]dioxepine. (a) Billig, E.; Abatjoglou, A. G.; Bryant, D. R. U. S. Patent, 4668651, 1987.
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58
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33846486147
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Billig, E, Abatjoglou, A. G, Bryant, D. R. U. S. Patent, 4769498, 1988
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(b) Billig, E.; Abatjoglou, A. G.; Bryant, D. R. U. S. Patent, 4769498, 1988.
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60
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33846518806
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Five-membered N-Boc-enamide (2%) and five-membered N-Boc-aminals (5%) were also isolated after the treatment with CSA. N-Ts-enamide and N-Ts-aminals were not obtained at all.
-
Five-membered N-Boc-enamide (2%) and five-membered N-Boc-aminals (5%) were also isolated after the treatment with CSA. N-Ts-enamide and N-Ts-aminals were not obtained at all.
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61
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33846558927
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Compound 10: colorless foam; [α]D22 -206.0 (c, 1.00, CHCl3, 1H NMR (CDCl3, δ, 1.21 (br s, 6.3 H, 1.41 (br s, 2.7 H, 1.77-1.85 (m, 1 H, 1.89-2.10 (br m, 1 H, 2.45 (s, 3 H, 3.87 (m, 1 H, 3.97 (d, J, 10.1 Hz, 1 H, 4.71 (br, 0.3 H, 4.78 (br, 0.7 H, 4.98 (br, 0.7 H, 5.15 (br, 0.3 H, 6.89-7.22 (m, 2 H, 7.28-7.38 (m, 5 H, 7.78 (m, 2 H, 13C NMR CDCl3, δ, 21.6, 25.5, 26.1, 27.9, 28.2, 49.8, 57.5, 58.9, 77.2, 81.3, 81.5, 101.0, 126.2, 126.6, 127.0, 128.0, 128.5, 129.9, 137.3, 137.7, 138.1, 143.7, 152.1. Anal. Calcd for C23H28N 7O4S: C, 64.46; H, 6.59; N, 6.54. Found: C, 64.37; H, 6.71; N, 6.54
-
4S: C, 64.46; H, 6.59; N, 6.54. Found: C, 64.37; H, 6.71; N, 6.54.
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62
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33846541310
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In the absence of TBAI, the N-alkylation was very slow at 0 °C. Compound 12, however, was afforded in 81% yield at r.t. in 5 h with the significant loss of enantiomeric purity 77% ee, which was probably caused by the elimination-addition sequence of the N-2-methoxybenzyl-tert- butyl carbamoyl group
-
In the absence of TBAI, the N-alkylation was very slow at 0 °C. Compound 12, however, was afforded in 81% yield at r.t. in 5 h with the significant loss of enantiomeric purity (77% ee), which was probably caused by the elimination-addition sequence of the N-2-methoxybenzyl-tert- butyl carbamoyl group.
-
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63
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33846530583
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Compound 12: colorless foam; [α]D21 -105.2 (c, 1.32, CHCl3, 1H NMR (CDCl3, δ, 1.19-1.70 (m, 21 H, 1.85 (br m, 1 H, 3.14 (br m, 1 H, 3.33 (br m, 1 H, 3.65 (s, 3 H, 3.75 (br m, 0.45 H, 3.99-4.10 (m, 1.65 H, 4.25 (br m, 0.45 H, 4.50 (br m, 0.45 H, 5.45 (br s, 0.9 H, 5.64 (br s, 0.1 H, 6.71 (m, 1 H, 6.86 (m, 1 H, 7.03 (m, 1 H, 7.12 (m, 1 H, 7.37-7.25 (m, 5 H, 13C NMR (CDCl3, δ, 22.4, 24.6, 28.2, 41.0, 41.6, 42.1, 55.1, 56.2, 57.0, 57.5, 77.2, 79.6, 109.8, 120.2, 126.4, 127.0, 128.0, 128.4, 140.2, 141.2, 155.9. Anal. Calcd for C29H40N2O 5: C, 70.13; H, 8.12; N, 5.64. Found: C, 69.90; H, 8.28; N, 5.54. The enantiomeric purity of 12 was determined to be >99% ee by HPLC [CHIRALCEL OD; hexane-i-PrOH, 30:1; λ, 220 nm; flow rate: 1.0 mL/min; tR(12, 6.8 min; tRent-12
-
R(ent-12) = 11.0 min].
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-
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64
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33846473053
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3): δ = 20.4, 28.2, 46.7, 47.8, 54.7, 54.8, 64.0, 109.8, 120.0, 126.3, 126.5, 127.8, 128.2, 129.6, 142.4, 157.6.
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3): δ = 20.4, 28.2, 46.7, 47.8, 54.7, 54.8, 64.0, 109.8, 120.0, 126.3, 126.5, 127.8, 128.2, 129.6, 142.4, 157.6.
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65
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33846550018
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Protection of C3-hydroxyl group as a benzoate was of choice for the subsequent hydroformylation.
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Protection of C3-hydroxyl group as a benzoate was of choice for the subsequent hydroformylation.
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66
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-
33846482498
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Compound 13: colorless viscous oil; [α]D 24-152.3 (c= 1.02, CHCl3, 1H NMR (CDCl3, δ, 1.25 (br s, 6 H, 1.40-1.55 (br m, 3 H, 2.05-2.25 (m, 1 H, 2.40 (m, 1 H, 4.83 (br m, 0.33 H, 4.93 (br m, 0.67 H, 5.40 (br m, 0.33 H, 5.46-5.63 (m, 1.67 H, 7.00-7.35 (m, 6 H, 7.40 (m, 2 H, 7.55 (m, 1 H, 7.90 (m, 2 H, 13C NMR CDCl3, δ, 23.7, 24.0, 27.9, 28.2, 56.0, 57.3, 69.2, 81.3, 100.4, 126.1, 126.4, 127.5, 127.6, 128.0, 128.35, 128.38, 129.69, 129.71, 129.8, 133.1, 138.6, 152.3, 165.6. Anal. Calcd for C23H25NO4: C, 72.80; H, 6.64; N, 3.69. Found: C, 72.76; H, 6.84; N, 3.66
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4: C, 72.80; H, 6.64; N, 3.69. Found: C, 72.76; H, 6.84; N, 3.66.
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67
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33846491289
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Five-membered aminals 4, were also isolated
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Five-membered aminals (4%) were also isolated.
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68
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33846501503
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Compound 14: colorless viscous oil; [α]D 22+56.7 (c, 1.3, CHCl3, Lit.1g [α]D15+53.77 (c, 1.0, CHCl3, Lit.2d [α]D25 +38.30 (c, 1.92, CHCl 3, 1H NMR(CDCl3, δ, 1.37 (s, 9 H, 1.54-1.62 (m, 1 H, 1.69 (m, 1 H, 1.76-1.87 (m, 3 H, 3.04 (m, 1 H, 4.01 (dd, J, 5.8, 12.8 Hz, 1 H, 4.09 (m, 1 H, 5.32 (d, J, 5.8 Hz, 1 H, 7.27 (m, 1 H, 7.37-7.32 (m, 2 H, 7.45 (m, 2 H, 13C NMR CDCl 3, δ, 23.1, 27.7, 28.3, 39.5, 59.3, 70.1, 79.9, 127.2, 128.4, 138.5, 155.4. Anal. Calcd for C16H23NO3: C, 69.29; H, 8.36; N, 5.05. Found: C, 69.21; H, 8.59; N, 4.77. The enantiomeric purity of 14 was determined to be >99% ee by HPLC [CHIRALCEL OJ-H; hexane-i-PrOH, 9:1; λ, 220 nm; flow rate: 1.0 mL/min; t R
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R(ent-14) = 5.75 min].
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69
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33846537915
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Compound 15: colorless oil; [α]D 23+43.3 (c, 1.60, CHCl3, Lit.1g [α]D28 +36.90 (c, 1.0, CHCl3, 1H NMR (CDCl3, δ, 1.46 (s, 9 H, 1.58-1.76 (m, 2 H, 1.94-2.05 (m, 2 H, 2.77 (ddd, J, 3.3, 13.4, 13.4 Hz, 1 H, 3.88 (m, 1 H, 3.95 (dd, J, 3.3, 13.4 Hz, 1 H, 4.71 (d, J, 12.5 Hz, 1 H, 4.75 (d, J, 12.5 Hz, 1 H, 5.70 (br s, 1 H, 7.25-7.36 (m, 3 H, 7.54 (br s, 1 H, 7.56 (br s, 1 H, 7.71 (br s, 2 H, 7.78 (br s, 1 H, 13C NMR (CDCl3, δ, 24.2, 25.8, 28.4, 39.2, 55.4, 69.1, 78.7, 80.1, 121.4 (m, 123.3 (q, J, 272 Hz, 127.0, 127.2, 128.28, 128.32, 131.6 (q, J, 32.9 Hz, 138.0, 141.0, 155.3. The enantiomeric purity of 15 was determined to be >99% ee by HPLC [CHIRALPAK IA; hexane-i-PrOH, 30:1; λ, 220 nm; flow rate: 0.3 mL/min; tR15, 14.1 min; tR
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R(ent-15) = 16.6 min)].
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70
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33846521720
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L-733,060 (2, 1H NMR (free base, CDCl3, δ, 1.53 (m, 1 H, 1.66-1.75 (m, 1 H, 1.88 (m, 1 H, 2.22 (br d, J, 14.0 Hz, 1 H, 2.85 (ddd, J, 3.1, 12.5, 12.5 Hz, 1 H, 3.29 (m, 1 H, 3.68 (br m, 1 H, 3.85 (d, J, 1.2 Hz, 1 H, 4.13 (d, J, 12.5 Hz, 1 H, 4.52 (d, J, 12.5 Hz, 1 H, 7.25-7.29 (m, 1 H, 7.30-7.35 (m, 2 H, 7.35-7.39 (m, 2 H, 7.44 (br s, 2 H, 7.69 (br s, 1 H, 13C NMR (free base, CDCl3, δ, 20.5, 28.4, 47.1, 64.2, 70.0, 77.3, 121.1 (hept, J, 4.1 Hz, 123.2 (q, J, 271 Hz, 126.7, 127.0, 127.4 (m, 128.1, 131.2 q, J, 32.9 Hz, 141.2, 141.9
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3): δ = 20.5, 28.4, 47.1, 64.2, 70.0, 77.3, 121.1 (hept, J = 4.1 Hz), 123.2 (q, J = 271 Hz), 126.7, 127.0, 127.4 (m), 128.1, 131.2 (q, J = 32.9 Hz), 141.2, 141.9.
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