Nucleophilic replacement of p-(1-chloro-2,2,2-trifluoroethyl)phenols: novel synthesis of β-trifluoromethyl-tyrosine
作者:Yuefa Gong、Katsuya Kato
DOI:10.1016/s0022-1139(03)00004-6
日期:2003.6
Three para-(1-chloro-2,2,2-trifluoroethyl)phenols 2a–c were prepared by selective α-chlorination of the corresponding alcohols 1a–c. Substitution of 2a by active methylene compound 4 proceeds smoothly in the presence of an appropriate base at room temperature, giving substituted products 5–9 in good yields. On the basis of this finding, both the important β-trifluoromethyl-tyrosine 15 and its derivatives
Facile Synthesis of o- and p-(1-Trifluoromethyl)-alkylated Phenols via Generation and Reaction of Quinone Methides
作者:Yuefa Gong、Katsuya Kato
DOI:10.1055/s-2002-20458
日期:——
Several ortho- and para-(1-chloro-2,2,2-trifluoroethyl)phenols were prepared from the corresponding alcohols and thionyl chloride in the presence of pyridine. They reacted smoothly with sodium borohydride and Grignard reagents under mild conditions, forming 2,2,2-trifluoroethyl- or 1-trifluoromethylalkylphenols in high yields.