Highly regioselective tandem formal substitution and decarboxylation of 2-acyl-1-chlorocyclopropanecarboxylates with sodium sulfinates
作者:Yuequan Zhu、Yuefa Gong
DOI:10.1016/j.tet.2016.04.062
日期:2016.6
cyclopropene quickly combines with sodium sulfinate via a regioselective 1,4-Michael addition. Subsequent esterolysis and decarboxylation of the 1,4-Michael adducts afforded 1-aroylsulfonyl-2-aroylcyclopropanes in high yields. This observation firstly demonstrates that direct Michael addition of sodium sulfinates with reactive cyclopropene is really workable.
本文报道了在碱性条件下烷基-2-酰基-1-氯环丙烷羧酸酯与亚磺酸钠的高度区域选择性串联形式的亲核取代和脱羧反应。实际上,通过简单的1,2-氯化氢消除,2-酰基-1-氯环丙烷甲酸烷基酯很容易转化为环丙烯中间体,并且这种高反应性的环丙烯通过区域选择性的1,4-迈克尔加成反应迅速与亚磺酸钠结合。1,4-迈克尔加合物的随后的酯解和脱羧以高收率提供了1-芳酰基磺酰基-2-芳酰基环丙烷。该观察结果首先证明,将亚硫酸钠与反应性环丙烯直接迈克尔加成是切实可行的。