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.
The reaction of alkynyl phenyl selenides with p-toluene-sulfonic acid gives rise to a proton-induced ring-closure reaction affording γ- and 5-lactones.
Stereocontrolled production of hydroxyester, hydroxyamide, and lactone compounds from chiral alpha-amino aldehydes
申请人:MERCK & CO. INC.
公开号:EP0491538A1
公开(公告)日:1992-06-24
A process for stereocontrolled preparation of a medicinally significant hydroxyester, hydroxyamide or lactone compound of structural formula:
comprises the addition of homoenolate equivalents to chiral α-amino aldehydes. The hydroxyester, hydroxyamide, or lactone reaction products are useful as inhibitors of the HIV protease or of renin, or as intermediates in the preparation of inhibitors of the HIV protease or renin.
One-Step Highly Diastereoselective Synthesis of γ-Aminoalkyl-Substituted γ-Butyrolactones by an Asymmetric Samarium-Mediated Ketyl−Alkene Coupling Reaction
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.