One-Step Highly Diastereoselective Synthesis of γ-Aminoalkyl-Substituted γ-Butyrolactones by an Asymmetric Samarium-Mediated Ketyl−Alkene Coupling Reaction
摘要:
The samarium(II) iodide mediated reaction of N,N-dibenzyl-protected (S)-alpha-amino aldehydes with (1S,2R)-N-methylephedrinyl acrylate gave the (4R,1'S)-gamma-(aminoalkyl)-gamma-butyrolactones in good yields with high diastereoselectivities (up to 80% de); (4R,1'S)-gamma-amino-(2-phenylethyl)-gamma-butyrolactone (6a), which should be a potent precursor for gamma-secretase inhibitors, was obtained with high de value.
Stereocontrolled convergent synthesis of hydroxyethylene dipeptide isosteres by the reaction of α-amino aldehyde with alkoxytitanium homoenolates
作者:Shinzo Kano、Tsutomu Yokomatsu、Shiroshi Shibuya
DOI:10.1016/0040-4039(91)80863-2
日期:1991.1
The reaction of (S)-α-dibenzylamino aldehydes with dichloroisopropoxytitanium esterhomoenolates gave the corresponding γ-aminoalkyl γ-lactones with high erythro selectivity. The same reaction by the use of amide homoenolates also afforded the corresponding 2-amino alcohols with high erythro-selectivity.