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65
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16944362130
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note
-
Direct ozonolytic cleavage of protected 43 affords 45 in 40% isolated yield (versus 64% for the two-step sequence shown in Scheme 10).
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-
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66
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16944363687
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note
-
Conditions originally reported by DeShong are 30 equiv of vinylene carbonate, 95°C, 72 h (cf. ref 29).
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-
-
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68
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0001254361
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For other related examples, see: (b) Belzecki, C.; Panfil, C. J. Org. Chem. 1979, 44, 1212-1216. (c) Vasella, A.; Voeffray, R. Helv. Chim. Acta. 1982, 65, 1134-1137 and references cited therein, (d) Kita, Y.; Itoh, F.; Tamura, O.; Ke, Y. Y. Tetrahedron Lett. 1987, 28, 1431-1434.
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and references cited therein
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For other related examples, see: (b) Belzecki, C.; Panfil, C. J. Org. Chem. 1979, 44, 1212-1216. (c) Vasella, A.; Voeffray, R. Helv. Chim. Acta. 1982, 65, 1134-1137 and references cited therein, (d) Kita, Y.; Itoh, F.; Tamura, O.; Ke, Y. Y. Tetrahedron Lett. 1987, 28, 1431-1434.
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Vasella, A.1
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0000604066
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For other related examples, see: (b) Belzecki, C.; Panfil, C. J. Org. Chem. 1979, 44, 1212-1216. (c) Vasella, A.; Voeffray, R. Helv. Chim. Acta. 1982, 65, 1134-1137 and references cited therein, (d) Kita, Y.; Itoh, F.; Tamura, O.; Ke, Y. Y. Tetrahedron Lett. 1987, 28, 1431-1434.
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Kita, Y.1
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72
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16944366833
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note
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For the use of this chiral auxiliary in stereoselective reactions with O-silylketene acetals, see ref 36d.
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73
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37049117646
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(a) Bjorgo, J.; Boyd, D. R.; Neill, D. C. J. Chem. Soc, Chem. Commun. 1974, 478-479.
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Neill, D.C.3
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84951267064
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Energy differences between E and Z nitrones have been measured: (b) Breuer, E.; Aurich, H.; Nielsen, A. In Nitrones, Nitronates and Nitroxides; John Wiley & Sons: New York, 1989; p 151.
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33947317869
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Firestone, R.A.1
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16944363283
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personal communication
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(b) Professor K. N. Houk, personal communication.
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Houk, K.N.1
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80
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0023043811
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and references cited therein
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(b) Houk, K. N.; Paddon-Row, M. N.; Rondan, N. G.; Wu, Y.-D.; Brown, F. K.; Spellmeyer, D. C.; Metz, J. T.; Li, Y.; Loncharich, R. J. Science 1986, 231, 1108-1117 and references cited therein.
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Brown, F.K.5
Spellmeyer, D.C.6
Metz, J.T.7
Li, Y.8
Loncharich, R.J.9
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81
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16944365454
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note
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2, Raney Ni, MeOH (14 h) afforded a complex mixture of unidentifiable products.
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-
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83
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16944366219
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note
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Several additional issues in connection to the transformation depicted in Scheme 16 merit comment: (1) In the formation of the intermediate methoxyacetal, the initial product consists of a 3:1 mixture of α:β isomers (after 8 h); however, after prolonged reaction times (70 h), the a anomer becomes the sole product. (2) Whereas formation of the above mentioned α-methylacetal requires 70 h, that of daunosamine (lacking the C2 axial OH) is complete within 30 min. This rate difference may be due to destabilization of the intermediate oxonium ion by the axially disposed hydroxide.
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84
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0001323353
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(a) Dahmen, J.; Frejd, T.; Mangusson, G.; Noori, G. Carbohydr. Res. 1983, 114, 328-330.
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Noori, G.4
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87
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16944365847
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note
-
2O used was freshly distilled, it is tenable that HF contamination gives rise to the observed intramolecular etherification.
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91
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0021135638
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(a) Nicolaou, K. C.; Dolle, R. E.; Papahatjis, D. P.; Randall, J. L.; J. Am. Chem. Soc. 1984, 106, 4189-4192.
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16944364104
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note
-
Diene carbinol 62 may also be prepared by direct coupling of the amine derived from 22 (cf. Scheme 4) with carboxylic acid 18 (cf. Scheme 6). However, this procedure is significantly lower yielding than reaction with silylated derivative 17 (85% vs 55-60%). The difference in efficiency likely arises from difficulties in the purification of 22 prior to the coupling procedure.
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-
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94
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0029849814
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0030791288
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More recent accounts from the laboratories of Grubbs and Sauvage indicate that the metathesis technology may be readily applied to the synthesis of marcocyclic crown ethers and [2]catenanes. See: (a) Marsella, M. J.; Maynard, H. D.; Grubbs, R. H. Angew. Chem., Int. Ed. Engl. 1997, 36, 1101-1103.
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Marsella, M.J.1
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(b) Mohr, B.; Weck, M.; Sauvage, J.-P.; Grubbs, R. H. Angew. Chem., Int. Ed. Engl. 1997, 36, 1308-1310.
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Mohr, B.1
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105
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16944364224
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note
-
General experimental information for select reagents and compounds not involved in the final synthesis route and copies of spectral data for all synthetic intermediates can be found in the Supporting Information section.
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106
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16944364542
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note
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3N.
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