Nucleophilic aromatic substitution using Et3SiH/cat. t-Bu-P4 as a system for nucleophile activation
作者:Masahiro Ueno、Misato Yonemoto、Masahiro Hashimoto、Andrew E. H. Wheatley、Hiroshi Naka、Yoshinori Kondo
DOI:10.1039/b700140a
日期:——
A novel type of deprotonative arylation of nucleophiles was conducted using Et3SiH/cat. t-Bu-P4 and the powerful SNAr reactions of aryl fluorides were accomplished using alcohols and malonates as nucleophiles.
A series of 2-[4-(thiazol-2-yl)phenyl]propionic acids substituted at various positions were prepared by the reaction of diethyl 2-methyl-2-(4-thiocarbamoylphenyl)malonates with alpha-bromoaldehyde diethyl acetals or alpha-haloketones followed by hydrolysis of esters. The inhibition of prostaglandin H synthetase (cyclooxygenase) was assayed by use of an enzyme preparation from guinea pig polymorphonuclear