Wittig reactions of chromone-3-carboxaldehydes with benzylidenetriphenyl phosphoranes: a new synthesis of 3-styrylchromones
作者:Angela Sandulache、Artur M. S. Silva、Diana C. G. A. Pinto、L�cia M. P. M. Almeida、Jos� A. S. Cavaleiro
DOI:10.1039/b303554a
日期:——
An efficient route to 3-styrylchromones has been developed and applied to syntheses of several new derivatives. Wittig reactions of chromone-3-carboxaldehydes with some benzylic ylides gave a diastereomeric mixture of (E) and (Z)-3-styrylchromones that are separable by thin layer chromatography. The (Z)-isomers were the most abundant diastereomers independent of having electron-withdrawing or electron-donating
已经开发了一种有效的3-苯乙烯基色酮的途径,并将其应用于几种新衍生物的合成。色酮-3-羧醛与一些苄基的维蒂希反应产生(E)和(Z)-3-苯乙烯基色酮的非对映异构体混合物,可通过薄层分离色谱法。(Z)异构体是最丰富的非对映异构体,与在其上具有吸电子或供电子取代基无关苯基戒指。使用以下方法确定获得的非对映异构体的立体化学烦躁 实验。