Face selectivity in the reactions of Grignard reagents with 5-substituted-2-dicyanomethyleneadamantanes
作者:Kuo-Hsi Kao、Ren-Shyang Sheu、Yuh-Shih Chen、Wen-Wei Lin、Ju-Tsung Liu、Ching-Fa Yao
DOI:10.1039/a901484e
日期:——
transfer of the benzyl or alkyl groups, or the hydride from the Grignard reagents is discussed in terms of the electrostatic field influence and the steric hindrance between the Grignard reagents and the substrate 4-Z. Reactions of 4-Br or 4-Ph with phenylmagnesium bromide generated 1,2-addition products 6-Br, 7-Br or 8-Ph when the intermediate A was added to dry methanol or to dilute ice-cold hydrochloric
5-取代2-二氰基亚甲基金刚烷(4-Z)与苄基溴化镁(C 6 H 5 CH 2 MgBr)或烷基卤化镁(RMgX)的反应生成1,4-加成(5-Z(R))和/或氢化(5-Z(H))产物。使用了多种取代基X:氢,氟,氯,溴和苯基。从zu- face或en生成不同的异构体产物从格氏试剂与底物4-Z之间的静电场影响和空间位阻方面讨论了通过苄基或烷基或格氏试剂的氢化物转移的表面。当将中间体A添加到干燥的甲醇中或稀释在冰冷的盐酸溶液中时,4-Br或4-Ph与苯基溴化镁的反应生成1,2-加成产物6-Br,7-Br或8-Ph。