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
三对- (1-氯-2,2,2-三氟乙基)酚2A - Ç分别用对应的醇的选择性α-氯化制备1A - Ç。取代图2a由活性亚甲基化合物4点在合适的碱,在室温下存在进行顺利,得到取代产物5 - 9以良好的收率。基于该发现,成功地合成了重要的β-三氟甲基酪氨酸15及其衍生物。