Regio- and Stereoselective Opening of Oxiranes through Neighbouring Group Participation: Stereocontrolled Synthesis of Enantiopure Hydroxylated Oxazolidin-2-ones
The regio- and stereo-selective ring opening of (S)-pyroglutaminol derived epoxides provides an effective route to protected syn,syn-aminodiol units. The procedure involves the chemoselective aminolysis or alcoholysis of (3R,4R,5R)-N-(tert-butoxycarbonyl)-3,4-epoxy-5-[(1-ethoxy)ethoxymethyl]pyrrolidin-2-one (10), followed by the formation in quantitative yield of oxazolidinone intermediates, through
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
Ring-opening of N-alkoxycarbonyl γ-lactams with lithium methylphenylsulphone: application to the synthesis of cis 2,5-disubstituted pyrrolidines
作者:Antonio J. Mota、Nicole Langlois
DOI:10.1016/s0040-4039(02)02839-3
日期:2003.2
The ring-opening of N-alkoxycarbonyl gamma-lactams with lithium methylphenyl sulphone was studied and applied to the synthesis of enantiopure cis 2,5-disubstituted pyrrolidines (C) 2003 Elsevier Science Ltd. All rights reserved.