申请人:The Scripps Research Institute
公开号:US06573387B1
公开(公告)日:2003-06-03
&agr;,&bgr;-Unsaturated amides and esters are converted to &agr;,&bgr;-substituted amino amides, esters, and acids. An &agr;,&bgr;unsaturated amide or ester is first converted to an &agr;,&bgr;-hydroxysulfonamide or hydroxycarbamate amide or ester using an osmium-catalyzed aminohydroxylation. The &agr;,&bgr;-hydroxysulfonamide or hydroxycarbamate amides or esters is then cyclodehydrated to produce a &agr;,&bgr;-N-sulfonyl- or the &agr;,&bgr;-N-carbamoylaziridine amide or ester. The ring of aziridine intermediate is then nucleophilically opened in a regioselective manner with a variety of nucleophiles to give the $g(&agr;,&bgr;-substituted amino- amides or esters. Preferred nucleophiles include sulfur, oxygen, carbon, and nitrogen nucleophiles.
α,β-不饱和酰胺和酯可以转化为α,β-取代氨基酰胺、酯和酸。首先,α,β-不饱和酰胺或酯通过奥斯米钯催化的氨基羟基化反应转化为α,β-羟基磺酰胺或羟基碳酸酯酰胺或酯。然后,α,β-羟基磺酰胺或羟基碳酸酯酰胺通过环脱水反应产生α,β-N-磺酰基或α,β-N-氨基甲酰环氮烷酰胺或酯。接着,环氮烷中间体的环被以多种亲核试剂以区域选择性的方式亲核打开,形成α,β-取代氨基酰胺或酯。首选的亲核试剂包括硫、氧、碳和氮亲核试剂。