Magnesium alkylidene carbenoids: Generation from 1-halovinyl sulfoxides with Grignard reagents and studies on their property, mechanism, and some synthetic uses
作者:Tsuyoshi Satoh、Koji Takano、Hiroyuki Ota、Hideaki Someya、Kenji Matsuda、Mai Koyama
DOI:10.1016/s0040-4020(98)00243-9
日期:1998.5
the ligand exchange reaction of sulfoxides with Grignard reagents. The generated magnesium alkylidene carbenoids were found to be stable at −78 °C for over 30 min. The carbenoids reacted with aldehydes to give the adducts in moderate yields; however, they were found to be relatively unreactive to usual electrophiles. The generated magnesium alkylidene carbenoid exists in equilibrium between an α-halo
通过亚砜与格利雅试剂的配体交换反应,由酮和芳基卤代甲基亚砜衍生的1-卤代亚砜生成亚烷基镁的类胡萝卜素。发现生成的亚烷基镁类胡萝卜素在-78°C稳定超过30分钟。类胡萝卜素与醛反应生成加合物,产率中等。然而,发现它们与通常的亲电试剂没有反应。产生的亚烷基镁类胡萝卜素在α-卤代烯基格氏试剂与亚烷基卡宾-卤化镁络合物之间平衡存在。观察到亚烷基类胡萝卜素的卤素交换和几何异构化。1-氯丙烯基亚砜与过量的芳基格氏试剂反应,得到具有芳基的烯基格氏试剂。