Efficient Total Synthesis of Pulchellalactam, a CD45 Protein Tyrosine Phosphatase Inhibitor
作者:Wen-Ren Li、Sung Tsai Lin、Nai-Mu Hsu、Meei-Shiou Chern
DOI:10.1021/jo010828j
日期:2002.7.1
A new approach to a CD45 protein tyrosine phosphatase inhibitor, pulchellalactam, is described. The key step of the sequence involves addition and elimination of an enolic lactam in a single step and 70% yield, employing an organocuprate reagent. The resulting alpha,beta-unsaturated lactam could be condensed with isobutyraldehyde to produce Z-pulchellalactam or converted into siloxypyrrole, which was
描述了一种新的CD45蛋白酪氨酸磷酸酶抑制剂的方法,pulchellalactam。该序列的关键步骤涉及使用有机铜酸盐试剂在一个步骤中以70%的产率添加和消除烯属内酰胺。可以将生成的α,β-不饱和内酰胺与异丁醛缩合生成Z-ulchellalactam或转化为甲硅烷氧基吡咯,将其与BF(3)x Et(2)O促进的异丁醛偶联反应后得到E-ulchellalactam E1-cB消除和TFA脱保护。第一次总合成通过六个步骤提供了Z-ulchellalactam,Boc-甘氨酸的总收率为32%。相同的反应顺序也可以应用于三官能化多菌灵内酰胺衍生物的液相或固相合成。