Synthesis of ethyl 1,2,2-tricyanocyclopropanecarboxylates from bromomalononitrile and ylidenecyanoacetate
作者:Yoon Chin Kim、Harold Hart
DOI:10.1039/j39690002409
日期:——
A general synthesis for ethyl 3,3-dialkyl- and 3-aryl-1,2,2-tricyanocyclopropanecarboxylates frombromomalononitrile and ylidenecyanoacetates is described. When stereoisomeric products are possible, the predominant and sometimes exclusive isomer obtained has the larger C-3 substituent and the ethoxycarbonyl group in the trans-position.
Reactions of electron-deficient alkenes with dibromomethylene compounds activated by cyanide and ester groups were promoted by LiI to afford the corresponding cyclopropanes in high yields.