Acylation of fluorocarbethoxy-substituted ylides: a simple and general route to .alpha.-fluoro .beta.-keto esters
摘要:
(Fluorocarbethoxymethylene)tri-n-butylphosphorane (3) reacts with acid chlorides and anhydrides to form the corresponding carbon acylated phosphonium salts 4, and hydrolysis of 4 under mild basic conditions provides RCOCFHCOOEt (8) in moderate yields. The reaction is applicable to primary, secondary, tertiary, cyclic, aromatic, and ester-substituted acid chlorides. Acylation with ethyl chloroformate and ethyl chlorothioformate leads to the diesters CFH(COOEt)2 and EtSCOCFHCOOEt. Extension of this reaction sequence to perfluorinated and partially fluorinated acid chlorides did not proceed cleanly to give the expected phosphonium salts. However, the anion derived from (EtO)2P(O)CFHC(O)OEt reacts with R(F)COCl to form the corresponding C-acylated phosphonates 10, and hydrolysis of 10 gives R(F)COCFHCOOEt.
A Facile P-C Bond Cleavage of 2-Fluoro-2-Phosphonyl-1,3-Dicarbonyl Compounds on Silica Gel
作者:Dae Young Kim
DOI:10.1080/00397910008087140
日期:2000.4
alpha-Fluoro-beta-keto esters and alpha-fluoromalonates were prepared by the P-C bond cleavage of 2-fluoro-2-phosphonyl-1,3-dicarbonyl compounds on wet silica gel.
THENAPPAN, ALAGAPPAN;BURTON, DONALD J., J. ORG. CHEM., 56,(1991) N, C. 273-277