Indium (III) mediated Markovnikov addition of malonates and β-ketoesters to terminal alkynes and the formation of Knoevenagel condensation products
作者:Ji Zhang、Peter G. Blazecka、Paul Angell、Mark Lovdahl、Timothy T. Curran
DOI:10.1016/j.tet.2005.05.065
日期:2005.8
active methylene compounds to terminal alkynes has been expanded to use malonates and low boiling terminal alkynes to form the Markovnikov addition products. Indium(III) chloride and indium(III) bromide were also found to be efficient catalysts. Knoevenagel condensation products were isolated when reactions involved a simple malonate or β-ketoester.
由三氟甲磺酸铟(III)介导的活性亚甲基化合物加成至末端炔烃已被扩展为使用丙二酸酯和低沸点末端炔烃以形成马尔可夫尼可夫加成产物。还发现氯化铟(III)和溴化铟(III)是有效的催化剂。当反应涉及简单的丙二酸酯或β-酮酸酯时,分离出Knoevenagel缩合产物。