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1
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0003178825
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N. Arakaki, K. Kawasaki, S. Yoshimatsu, Bull. Okinawa Agric. Exp. Stn. 1977, 18, 29-38.
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(1977)
Bull. Okinawa Agric. Exp. Stn
, vol.18
, pp. 29-38
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Arakaki, N.1
Kawasaki, K.2
Yoshimatsu, S.3
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2
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0035931422
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S. Wakamura, N. Arakaki, M. Yamamoto, S. Hiradate, H. Yasui, T. Yasuda, T. Ando, Tetrahedron Lett. 2001, 42, 687-689.
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(2001)
Tetrahedron Lett
, vol.42
, pp. 687-689
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Wakamura, S.1
Arakaki, N.2
Yamamoto, M.3
Hiradate, S.4
Yasui, H.5
Yasuda, T.6
Ando, T.7
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3
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35549012137
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For an excellent classification of pheromones, see: a
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For an excellent classification of pheromones, see: a) http://www.nysaes.cornell.edu/pheronet;
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4
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35548998964
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In February 2004 a new pherolist was created by Peter Witzgall, Tobias Lindblom, Marie Bengtsson and Miklós Tóth
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b) In February 2004 a new pherolist was created by Peter Witzgall, Tobias Lindblom, Marie Bengtsson and Miklós Tóth: http://www-pherolist. slu.se/pherolist.php.
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7
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0026495369
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For a one-pot vicinal-diol-to-epoxide conversion, see
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For a one-pot vicinal-diol-to-epoxide conversion, see: H. C. Kolb, K. B. Sharpless, Tetrahedron 1992, 48, 10515-10528.
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(1992)
Tetrahedron
, vol.48
, pp. 10515-10528
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Kolb, H.C.1
Sharpless, K.B.2
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8
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35548997244
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If diethyl L-tartrate is protected as a cyclic orthoacetate and carried forward (7 → 5 → 2, route A) then compound 2 can be converted directly into 1. However, by acetonide protection (7 → 6 → 3, route B), the conversion of compound 3 into 1 has to proceed via the orthoacetate 2, which is the intermediate in the diol-to-epoxide conversion. This means one extra step of acetonide deprotection. Similarly the conversion of 7 into 4 proceeds via compound 6.
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If diethyl L-tartrate is protected as a cyclic orthoacetate and carried forward (7 → 5 → 2, route A) then compound 2 can be converted directly into 1. However, by acetonide protection (7 → 6 → 3, route B), the conversion of compound 3 into 1 has to proceed via the orthoacetate 2, which is the intermediate in the diol-to-epoxide conversion. This means one extra step of acetonide deprotection. Similarly the conversion of 7 into 4 proceeds via compound 6.
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9
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0026505441
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L. Longobardo, G. Mobbili, E. Tagliavini, C. Trombini, A. Umani-Ronchi, Tetrahedron 1992, 48, 1299-1316.
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(1992)
Tetrahedron
, vol.48
, pp. 1299-1316
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Longobardo, L.1
Mobbili, G.2
Tagliavini, E.3
Trombini, C.4
Umani-Ronchi, A.5
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10
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0021873440
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4, see: K. C. Nicolaou, D. P. Papahatjis, D. A. Claremon, R. L. Magolda, R. E. Dolle, J. Org. Chem. 1985, 50, 1440-1456.
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4, see: K. C. Nicolaou, D. P. Papahatjis, D. A. Claremon, R. L. Magolda, R. E. Dolle, J. Org. Chem. 1985, 50, 1440-1456.
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12
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0028929730
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3).
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3).
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13
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84985052469
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3) in b) E. Hungerbuhler, D. Seebach, Helv. Chim. Acta 1981, 64, 687-702.
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3) in b) E. Hungerbuhler, D. Seebach, Helv. Chim. Acta 1981, 64, 687-702.
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14
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0742304332
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The diol 12 was treated with trimethyl orthoacetate and catalytic p-TsOH in dry CH2Cl2 at 0°C After complete consumption of the starting material (TLC, 1.5 h) a fast-moving spot was detected on a TLC sheet which we believed could be cyclic orthoacetate 5. Also a polar spot corresponding to 13 and 14 was noticed. After aqueous work-up and column chromatography 13 and 14 were isolated as a mixture. The integration of the allylic proton (C-3) and also the acetyl (CH3) group indicated that 13 and 14 were present in a 1:3 ratio. However, we did not investigate which is the major isomer. Even avoiding aqueous work-up, that is, quenching the reaction with solid NaHCO 3, filtration, concentration and column chromatography, afforded the mixture in the same ratio. For a similar conversion of vicinal diols to monoacetoxy products using trimethyl orthoacetate, see: M. Ikejiri, K. Miyashit
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3, filtration, concentration and column chromatography, afforded the mixture in the same ratio. For a similar conversion of vicinal diols to monoacetoxy products using trimethyl orthoacetate, see: M. Ikejiri, K. Miyashita, T. Tsunemi, T. Imanishi, Tetrahedron Lett. 2004, 45, 1243-1246.
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15
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35549004279
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If the cyclic orthoacetate was stable to multistep reactions we could save one step in the synthetic strategy, that is, route A vs. route B see Scheme 1
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If the cyclic orthoacetate was stable to multistep reactions we could save one step in the synthetic strategy, that is, route A vs. route B (see Scheme 1).
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16
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35548990811
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The intermediates are shown below. The cyclic orthoacetate is formed as exemplified by this conversion, though probably it is not stable to isolation, Chemical Equation Presented
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The intermediates are shown below. The cyclic orthoacetate is formed as exemplified by this conversion, though probably it is not stable to isolation. (Chemical Equation Presented)
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17
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0034731635
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For an example of debenzylation with Pearlman's catalyst in the presence of an epoxide, see
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For an example of debenzylation with Pearlman's catalyst in the presence of an epoxide, see: D.-G. Liu, B. Wang, G.-Q. Lin, J. Org. Chem. 2000, 65, 9114-9119.
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(2000)
J. Org. Chem
, vol.65
, pp. 9114-9119
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Liu, D.-G.1
Wang, B.2
Lin, G.-Q.3
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18
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0001697761
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W. R. Roush, K. Ando, D. B. Powers, A. D. Patkowitz, R. L. Halterman, J. Am. Chem. Soc. 1990, 112, 6339-6348.
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(1990)
J. Am. Chem. Soc
, vol.112
, pp. 6339-6348
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Roush, W.R.1
Ando, K.2
Powers, D.B.3
Patkowitz, A.D.4
Halterman, R.L.5
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19
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35548945565
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The optical rotation value for this compound did not match with that reported in ref.[4
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[4]
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20
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35548989937
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Individual peaks are assigned in analogy with ref.[5
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[5]
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