Oxidative Rearrangement of 1-Alkylidene-1,2,3,4-tetrahydro-2-(trichloroacetyl)isoquinolines to 1,5,6,10b-Tetrahydro-10b-(trichloromethyl)-3H-oxazolo[4,3-a]isoquinolin-3-ones
作者:George R. Lenz、Ralph A. Lessor、Patrice W. Rafalko、Edward F. Ezell、Zenyk Kosarych、Lars Meyer、Paul Margaretha
DOI:10.1002/hlca.200490065
日期:2004.3
1-(alkylidene)-1,2,3,4-tetrahydro-N-(trichloroacetyl)isoquinolines 2a–2c as well as the tribromoacetyl derivative 4 undergo an oxidative cyclization with concomitant migration of the trihalogenomethyl group to afford the 1,5,6,10b-tetrahydro-10b-(trichloromethyl)-3H-oxazolo[4,3-a]isoquinolin-3-ones 3a–3c or the tribromomethyl derivative 6, respectively. These tricycles are also accessible via esterification of 3
用四乙酸铅(Pb(OAc)4)处理后,1-(亚烷基)-1,2,3,4-四氢-N-(三氯乙酰基)异喹啉2a - 2c以及三溴乙酰基衍生物4经历氧化环化伴随三卤代甲基的迁移,得到1,5,6,10b-四氢-10b-(三氯甲基)-3 H-恶唑并[4,3- a ]异喹啉-3-酮3a – 3c或三溴甲基衍生物6, 分别。这些三环化合物也可以通过3,4-二氢-1-(1-羟基-1-甲基乙基)异喹啉8的酯化反应获得分别使用三氯乙酰氯或三溴乙酰溴。对这些反应的合理的机理描述涉及到前所未有的“分子内亚氨基卤形”重排。