An efficient stereoselective synthesis of .DELTA.4,5-pipecolic esters
摘要:
The synthesis of racemic and enantiomerically homogeneous pipecolic esters from 1-amino-3-buten-2-ols is reported. The synthesis of enantiomerically homogeneous N-methylpipecolic esters requires four chemical steps from N-t-BOC-protected amino esters. The key step of the sequence is a conformationally restricted Claisen rearrangement. The method affords complete control of the absolute and relative stereochemistry of all three stereogenic centers in pipecolic ester 22 which is obtained in 33% overall yield from N-t-BOC-L-alanine ethyl ester 16a.
OVERMAN, L. E.;KAKIMOTO, MASA-AKI;OKAZAKI, M. E.;MEIER, G. P., J. AM. CHEM. SOC., 1983, 105, N 22, 6622-6629
作者:OVERMAN, L. E.、KAKIMOTO, MASA-AKI、OKAZAKI, M. E.、MEIER, G. P.
DOI:——
日期:——
An efficient stereoselective synthesis of .DELTA.4,5-pipecolic esters
作者:Steven R. Angle、J. Guy Breitenbucher、Damian O. Arnaiz
DOI:10.1021/jo00048a030
日期:1992.10
The synthesis of racemic and enantiomerically homogeneous pipecolic esters from 1-amino-3-buten-2-ols is reported. The synthesis of enantiomerically homogeneous N-methylpipecolic esters requires four chemical steps from N-t-BOC-protected amino esters. The key step of the sequence is a conformationally restricted Claisen rearrangement. The method affords complete control of the absolute and relative stereochemistry of all three stereogenic centers in pipecolic ester 22 which is obtained in 33% overall yield from N-t-BOC-L-alanine ethyl ester 16a.
Synthesis applications of aza-Cope rearrangements. 11. Carbon-carbon bond formation under mild conditions via tandem cationic aza-Cope rearrangement-Mannich reactions. A convenient synthesis of polysubstituted pyrrolidines
作者:Larry E. Overman、Masaaki Kakimoto、Mark E. Okazaki、G. Patrick Meier
DOI:10.1021/ja00360a013
日期:1983.10
Preparation des methoxy-2 (ou hydroxy-2) alcene-3ylamines de depart. Preparation d'acetyl-3 pyrrolidines par reaction de methoxy-2 (ou hydroxy-2) methyl-2 butene-3 ylamine avec des aldehydes et par transposition de methyl-5 vinyl-5 oxazolidines. Preparation de formyl-3 pyrrolidines
制备甲氧基-2(或羟基-2)alcene-3ylamines de 离开。制备 d'乙酰基-3 吡咯烷对甲氧基-2 (ou 羟基-2) 甲基-2 丁烯-3 基胺 avec des 醛和对位转位脱甲基-5 乙烯基-5 恶唑烷。deformyl-3 吡咯烷的制备