A short enantioselective access to 2,3,6-trialkylpiperidines and 5,8-dialkylindolizidines
摘要:
An enantioselective access to 2,3,6-trialkylpiperidines 5 is described. This sequence is illustrated by the four-step syntheses, from salts 1, of piperidine 6 and indolizidines 7 and 8. The overall yields are in the range 10-15%. The stereochemistry of intermediates is discussed, supported by two X-ray studies, and comparison with analogs. Stereochemical properties of intermediate oxazolidine derivatives 4 were used to orient the syntheses towards different diastereoisomers such as 7 or 8. (C) 1998 Elsevier Science Ltd. All rights reserved.
A short enantioselective access to 2,3,6-trialkylpiperidines and 5,8-dialkylindolizidines
摘要:
An enantioselective access to 2,3,6-trialkylpiperidines 5 is described. This sequence is illustrated by the four-step syntheses, from salts 1, of piperidine 6 and indolizidines 7 and 8. The overall yields are in the range 10-15%. The stereochemistry of intermediates is discussed, supported by two X-ray studies, and comparison with analogs. Stereochemical properties of intermediate oxazolidine derivatives 4 were used to orient the syntheses towards different diastereoisomers such as 7 or 8. (C) 1998 Elsevier Science Ltd. All rights reserved.
A short enantioselective access to 2,3,6-trialkylpiperidines and 5,8-dialkylindolizidines
作者:Yung-Sing Wong、Dino Gnecco、Christian Marazano、Angèle Chiaroni、Claude Riche、Annick Billion、Bhupesh C. Das
DOI:10.1016/s0040-4020(98)00566-3
日期:1998.8
An enantioselective access to 2,3,6-trialkylpiperidines 5 is described. This sequence is illustrated by the four-step syntheses, from salts 1, of piperidine 6 and indolizidines 7 and 8. The overall yields are in the range 10-15%. The stereochemistry of intermediates is discussed, supported by two X-ray studies, and comparison with analogs. Stereochemical properties of intermediate oxazolidine derivatives 4 were used to orient the syntheses towards different diastereoisomers such as 7 or 8. (C) 1998 Elsevier Science Ltd. All rights reserved.