Synthesis of Functionalized α,α-Disubstituted β-Alkynyl Esters from Allenoates through an Alkynylenolate Intermediate
作者:Weibo Wang、Bo Xu、Gerald B. Hammond
DOI:10.1021/ol801287t
日期:2008.9.1
Highly substituted alpha,alpha-disubstituted beta-alkynyl esters are readily prepared from allenyl esters and either alkyl halide, acid chloride, or alkyl chloroformate, mediated by an amide base. This highly efficient and mild process tolerates various functional groups and provides alpha,alpha-disubstituted beta-alkynyl esters in good to excellent yields. This method is especially suitable for the
C-alkylation of αβ-acetylenic esters using electrochemically generated intermediates
作者:Masao Tokuda、Osamu Nishio
DOI:10.1039/c39800000188
日期:——
Electrolysis at a platinum cathode of ethyl alk-2-ynoates in the presence of an excess of alkyl iodide in hexamethylphosphoramide or dimethylformamide solution containing tetra-n-butylammonium iodide gave the corresponding non-conjugated dialkylation products, ethyl 2,2-dialkylalk-3-ynoates, in good yield.