Efficient Enantio- and Diastereodivergent Synthesis of Poison-Frog Alkaloids <b>251O</b> and <i>trans</i>-<b>223B</b>
作者:Naoki Toyooka、Dejun Zhou、Hideo Nemoto、Yasuhiro Tezuka、Shigetoshi Kadota、Nirina R. Andriamaharavo、H. Martin Garraffo、Thomas F. Spande、John W. Daly
DOI:10.1021/jo901100m
日期:2009.9.4
An efficient and flexible synthesis of poison-frog alkaloids 251O and trans-223B has been achieved by using for both alkaloids an enantiodivergent process starting from the common lactam 1. The relative stereochemistry of 251O and trans-223B was determined to be 7 (R = n-C7H15, R' = n-Pr) and 14 by the present enantioselective synthesis.
WO2020128925A5
申请人:——
公开号:WO2020128925A5
公开(公告)日:2022-11-07
Selenium-promoted synthesis of enantiopure octahydroindolizines, hexahydro-1H-pyrrolizines and hexahydro-3H-pyrrolizin-3-ones
Enantiomerically pure disubstituted pyrrolidines, recently synthesized from commercially available enantiomerically pure beta-aminoalcohol, were used as starting materials to synthesize enantiomerically pure hexahydro-1H-pyrrolizines and octahydroindolizine through a cyclization reaction promoted by N-(phenylseleno)phthalimide. Similarly, starting from enantiopure 5-(hydroxymethyl)pyrrolidin-2-ones, enantiopure hexahydro-3H-pyrrolizin-3-ones were obtained. (C) 2008 Elsevier Ltd. All rights reserved.