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
Diastereo- and enantioselective syntheses of (−)-coniine, (−)-solenopsin A, (−)-solenopsis fugaz venom and (−)-xenovenine via deoxygenative decarboxylation of 2-carbonylsultam-substituted n-hydroxy-piperidines and -pyrrolidines
作者:Wolfgang Oppolzer、Christian G. Bochet、Eric Merifield
DOI:10.1016/0040-4039(94)88213-4
日期:1994.9
Heating cyclic 2-carbonylsultam-substituted N-hydroxylamines 4 with NaH yields sultam auxiliary 8 and imines 10, which are trapped in situ either by i-Bu2AlH or organocerium reagents to give enantiomerically pure 2-mono- or trans-2,6(2,5)-disubstituted piperidines (pyrrolidines) 11 or 12.
Asymmetric synthesis XIII synthesis of 2-alkylpyrrolidines: Towards azabicyclic systems
作者:S. Arseniyadis、P.Q. Huang、H.-P. Husson
DOI:10.1016/s0040-4039(00)80168-9
日期:——
The enantiospecific synthesis of a series of 2(S)-alkylpyrrolidines from 2-cyano oxazolopyrrolidine synthon is described. Two of the synthesised compounds represent key intermediates towards ozabicyclic alkaloids.
Hydroboration–azide alkylation as efficient tandem reactions for the synthesis of chiral non racemic substituted pyrrolidines
作者:Anne Salmon、Bertrand Carboni
DOI:10.1016/s0022-328x(98)00665-2
日期:1998.9
The synthesis of chiral non racemic substituted pyrrolidines from homoallylic alcohols is presented. These precursors are readily converted via the azides to the corresponding pyrrolidines using hydroboration-cycloalkylation tandem reactions as key steps. (C) 1998 Elsevier Science S.A. All rights reserved.
A simple asymmetric synthesis of 2-substituted pyrrolidines from 3-acylpropionic acids
作者:A. I. Meyers、Laurence E. Burgess
DOI:10.1021/jo00007a011
日期:1991.3
The title compounds have been prepared from 3-acylpropionic acids 2 and (-)-R-phenylglycinol in a three-step sequence in > 98% enantiomeric excess. The R group in 2 ultimately becomes the 2-substituent in the chiral pyrrolidine.