Intramolecular 2-Propylidene-1,3-bis(silane) Imine Cyclizations. An Efficient New Procedure for the Stereocontrolled Synthesis of Pyrrolidines, Isotropanes, and Bridged Pyrrolizidines
Intramolecular 2-Propylidene-1,3-bis(silane) Imine Cyclizations. An Efficient New Procedure for the Stereocontrolled Synthesis of Pyrrolidines, Isotropanes, and Bridged Pyrrolizidines
Intramolecular 2-Propylidene-1,3-bis(silane) Imine Cyclizations. An Efficient New Procedure for the Stereocontrolled Synthesis of Pyrrolidines, Isotropanes, and Bridged Pyrrolizidines
作者:Timothy Kercher、Tom Livinghouse
DOI:10.1021/ja954136m
日期:1996.1.1
Stereocontrolled Synthesis of 5-Acyl-3,4-dihydro-2<i>H</i>-pyrroles and Related Heterocycles via Intramolecular 2-Propylidene-1,3-bis(silane)−Acylnitrilium Ion Cyclizations
作者:Timothy Kercher、Tom Livinghouse
DOI:10.1021/jo961452q
日期:1997.2.1
2-Propylidene-1,3-bis(silane)s have been shown to be highly effective terminators in heteroannulations initiated by C-acylnitrilium ions. These cyclizations proceed under exceedingly mild reaction conditions with good to excellent levels of substrate-derived stereocontrol to provide the corresponding Delta(1)-pyrrolines possessing a functionalizable allylsilane moiety. Sequential reduction/N-tosylation of these products leads to the stereoselective formation of cis-pyrrolidine derivatives.