作者:K.C. Nicolaou、N.A. Petasis、D.A. Claremon
DOI:10.1016/s0040-4020(01)96722-5
日期:1985.1
functionality. Its facile introduction into organic molecules and its subsequent oxidative or reductive removal, has allowed many important synthetic transformations.1–7 Due to the fact that, similarly to halogens, it can exist either as an electrophilic species (PhSe+) or as a nucleophilic one (PhSe-), this group can be introduced either via nucleophilic substrates (e.g. carbanions, olefins), or via electrophilic
近年来,苯硒基(PhSe)已发展成为一种非常有用且用途广泛的功能。它易于引入有机分子并随后被氧化或还原去除,从而实现了许多重要的合成转化。1-7由于,类似于卤素,它可以存在作为一个电子物质的事实(PHSE +)或亲核酮(PHSE - ),既可以通过亲核底物被引入该基团(例如负碳离子,烯烃)如方案1所示,或通过亲电试剂(例如环氧化物,卤化物)。苯硒基的另一个有价值的方面是,它很容易被氧化成相应的硒氧化物(PhSe(O)-),该硒氧化物经历了β-氢的提取和同步-在相对温和的条件下消除形成烯烃(方案2(a))。此外,在适当的还原剂的作用下,该基团可以被氢取代(方案2(b))。