One-Pot Synthesis of 4-Substituted 3-Amino-2-cyanothiophenes Involving <i>O</i>-Ethyl Thioformate
作者:Haiming Zhang、Mark S. Bednarz、Ngiap-Kie Lim、Gonzalo Hernandez、Wenxue Wu
DOI:10.1021/ol500895t
日期:2014.5.2
An efficient one-pot synthesis of 4-substituted 3-amino-2-cyanothiophenes is described. Treatment of 2-alkyl or aryl substituted acetonitrile sequentially with 2.1 equiv of LDA, 1.1 equiv of O-ethyl thioformate, and 1.2 equiv of 2-chloroacetonitrile afforded the thiophenes in moderate to good yields. The thiophene core can be readily incorporated into more elaborate pharmaceutically relevant structures
描述了4-取代的3-氨基-2-氰基噻吩的有效的一锅合成。依次用2.1当量的LDA,1.1当量的O-乙基硫代甲酸酯和1.2当量的2-氯乙腈处理2-烷基或芳基取代的乙腈,以中等至良好的产率得到噻吩。噻吩核心可以很容易地并入更精细的药学相关结构,如仅需两个步骤即可将3-氨基-2-氰基-4-苯基噻吩(1g)转化为各种官能化的噻吩并[3,2- d ]嘧啶类化合物。