作者:A. Hirwe、K.G. Marathe、S.S. Mohorkar、K. Ramdas、C.B. Singh
DOI:10.1016/s0040-4020(01)87374-9
日期:1986.1
Some reactions of 4-substituted flavans have been studied. 4-Chloro/bromo derivatives react under neutral conditions with phthalimide and acetonitrile leading to displacement or axial halogen by nitrogen with inversion. In contrast, irrespective of the stereochemistry, 4-hydroxy-derivatives react under acidic or basic conditions leading to axial attack by the nudeophiles SOCl2, PCl3, PCl5, SOBr2, PBr3
已经研究了4-取代的黄烷的一些反应。4-氯/溴衍生物在中性条件下与邻苯二甲酰亚胺和乙腈反应,导致氮转化而取代或轴向被卤素取代。相反,无论立体化学如何,4-羟基衍生物在酸性或碱性条件下反应都会导致亲核体SOCl 2,PCl 3,PCl 5,SOBr 2,PBr 3,PBr 5,乙腈和水引起轴向攻击。苄基碳正离子的中间形成。