Enantioselective Syntheses
of 2-Substituted Pyrrolidines from Allylamines by Domino Hydroformylation-Condensation:
Short Syntheses of (<i>S</i>)-Nicotine and the
Alkaloid 225C
作者:Günter Helmchen、Pierre Dübon、Andreas Farwick
DOI:10.1055/s-0029-1217165
日期:——
2-substituted pyrrolidines based on rhodium-catalyzed hydroformylations of allylamines and their N-alkyl and N-acyl derivatives, which were prepared by asymmetric allylic substitutions, are described. The outcome of the hydrofonnylation reaction was controlled by the substituent at nitrogen, not by the substituent at carbon. In the case of N-alkylallylamines in situ reduction to the pyrrolidines occurred
Asymmetric synthesis X: A chiral pyrrolidine synthon for a new approach to the synthesis of alkaloids
作者:P.Q Huang、S Arseniyadis、H.-P Husson
DOI:10.1016/s0040-4039(00)95778-2
日期:1987.1
The synthesis of chiral 2-cyano-5-oxazolopyrrolidine is reported. The synthesis of the optically pure ant venom alkolaid, (+)-(S)--2-heptyl-5-butyl-pyrrolidine , has been achieved from .
centre at C-2 of the pyrrolidine ring. The first enantioselective synthesis of (+)-(S)-trans-2-heptyl-5-ethyl-pyrrolidine 9, a component of the venom of the ant Solenopsispunctaticeps served as an example of the method. Bothenantiomers of cis-2-heptyl-5-ethyl pyrrolidine 13 were obtained from the minor diastereomers 7 and 8 which were formed on reaction of oxazolidines 5a and 5b with Grignard reagents