New Diastereoselective Route to 2-Substitutedcis-(2S,5S)- andtrans-(2S,5R)-5-Alkylpyrrolidines as Indolizidine and Pyrrolizidine Scaffolds
作者:Antonio J. Mota、Angèle Chiaroni、Nicole Langlois
DOI:10.1002/ejoc.200300393
日期:2003.11
A new and short stereoselective route to the synthesis of enantiopure cis-2,5-disubstituted pyrrolidines as indolizidine or pyrrolizidine scaffolds has been developed. The method, which uses (S)-pyroglutamic acid as a chiral starting material, is based on the ring opening of N-protected γ-lactams by alkyl phenyl sulfone carbanions, followed by desulfonylation and reductive amination of alkyl γ-amino
已经开发了合成对映体纯 cis-2,5-二取代吡咯烷作为吲哚里西啶或吡咯里西啶支架的新的短立体选择性路线。该方法使用 (S)-焦谷氨酸作为手性原料,基于烷基苯砜碳负离子对 N-保护的 γ-内酰胺开环,然后对烷基 γ-氨基酮进行脱磺酰化和还原胺化。非对映选择性取决于起始 γ-内酰胺的取代基和苯砜的烷基。在 5-烷基脯氨酸叔丁酯的形成过程中观察到总顺式非对映选择性。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)