Chemistry of novel compounds with multifunctional carbon structure. VI. Synthetic studies and 19F-nuclear magnetic resonance investigation of novel .ALPHA.,.ALPHA.-disubstituted fluoroacetates.
Highly Regioselective Fluorination and Iodination of Alkynyl Enolates
作者:Han Yang、Bo Xu、Gerald B. Hammond
DOI:10.1021/ol802451e
日期:2008.12.18
A simple yet efficient approach to various functionalized quaternary alpha-alkynyl alpha-fluoro esters and gamma-iodoallenoates from readily available allenoates through an alkynyl enolate intermediate generated by LDA is presented. Reaction of this alkynyl enolate with NFSI gives the alpha-product (alpha-alkynyl-alpha-fluoro ester), whereas the reaction of the silyl ether of alkynyl enolate with I-2 gives solely the gamma-product (iodoallenoate).
TAKEUCHI, YOSHIO;OGURA, HIRONOBU;ISHII, YOHKO;KOIZUMI, TORU, CHEM. AND PHARM. BULL., 38,(1990) N, C. 2404-2408