A New General Access to α-Trifluoromethyl-Substituted Aromatic and Heteroaromatic α-Amino Acids Syntheses of α-trifluoromethyl substituted heteroarylglycine and phenylalanine derivatives 7 bzw. 12a from 5-fluoro-2-phenyl-4-trifluoromethyloxazole (2) are described. The key step of the new method is a 1,3-benzyl shift from oxygen to carbon. The isolation of mixed products in "cross experiments"in the phenylalanine series supports the notion that the 1,3-benzyl shift is not a 1,3-sigmatropic process.
一种新的通用方法用于合成α-三
氟甲基取代的芳香族和杂芳香族
α-氨基酸。从5-
氟-2-苯基-4-三
氟甲氧杂烯(2)合成α-三
氟甲基取代的杂芳甘
氨酸和苯丙
氨酸衍
生物7及12a。新方法的关键步骤是从氧到碳的1,3-苄基移位。在苯丙
氨酸系列的“交叉实验”中分离混合产品,支持1,3-苄基移位不是1,3-σ转位过程的观点。