作者:István Sallay、R.H. Ayers
DOI:10.1016/s0040-4020(01)98565-5
日期:1963.1
The von Braun degradation of tetrahydroberberine (I), base-B (IIIa) and dihydrobase-B (IIIb) are described. Compound I shows an N7C6 and an N7C14 ring opening, producing two cyanamides IV and VII. Contrary to the von Braun rule, C8 is not attacked by the bromide anion. Cyanogen bromide cleaves IIIa and IIIb unexpectedly between N2C3, furnishing XXa and XXb, respectively. The structures of the above
描述了四氢小ber碱(I),碱-B(IIIa)和二氢碱-B(IIIb)的von Braun降解。化合物I显示出N 7 = C 6和N 7 = C 14的开环,产生两个氰胺IV和VII。与冯·布劳恩规则相反,C 8不受溴化物阴离子的攻击。溴化氰裂解Ⅲa和Ⅲb出乎意料N的2 C 3,分别家具XXA和XXB。以上产品及其衍生物的结构已经确定。