The versatility of a titanium-inducedreductive oxo-amide coupling reaction is illustrated by the syntheses of the alkaloids secofascaplysin 8 and indolopyridocoline 14 as well as by an efficient and flexible approach to the arylated indole-2-carboxylic acid 4, which has recently been disclosed as a promising endothelin-receptor-antagonist. Depending on the particular substitution pattern in the substrates
AbstractUnder copper(I) or silver(I)/base cocatalysis conditions, transient 2H‐pyrroline intermediates generated by the cycloaddition of isocyanoacetates and olefins can be in situ subjected to further transformations. A strategically novel, convergent, mild, efficient, general and atom‐economic access to cis‐3a,8a‐hexahydropyrrolo[2,3‐b]indoles, which are core scaffolds in many biologically important natural products, has been developed based on this concept.magnified image
A general method for the synthesis of isatins: Preparation of regiospecifically functionalized isatins from anilines
作者:Piyasena Hewawasam、Nicholas A. Meanwell
DOI:10.1016/0040-4039(94)85299-5
日期:1994.10
A new method has been developed for regiospecific conversion of substituted anilines to isatins. The method utilizes the reaction of an ortho-lithiated, protected aniline derivative with diethyl oxalate to furnish an α-ketoester. Hydrolytic deprotection of the amino moiety is accompanied by cyclization to provide the isatin.