作者:Filip Gracias、Hana Dvořáková、Tomáš Martinů
DOI:10.1016/j.tetlet.2017.01.020
日期:2017.2
The attempted O-tosylation of tetracyclo[3.2.0.02,7.04,6]heptan-3-one (quadricyclanone) oxime with p-toluenesulfonyl chloride in dichloromethane in the presence of triethylamine/DMAP or pyridine resulted in the Beckmann fragmentation to give a mixture of 4-exo-/4-endo-tosyloxy- and 4-exo-/4-endo-chlorobicyclo[3.1.0]hex-2-ene-6-endo-carbonitriles in 90% overall yield. Solvolysis of all four products
在存在三乙胺/ DMAP或吡啶的情况下,在二氯甲烷中尝试用对甲苯磺酰氯将四环[3.2.0.0 2,7 .0 4,6 ]庚-3-酮(四环酮酮)肟的O-甲苯磺酰化反应导致贝克曼断裂得到4-混合物外型- / 4-内切-tosyloxy-和4-外- / 4-内切-chlorobicyclo [3.1.0]己-2-烯-6-内-carbonitriles在90%的总收率。所有四种产物在2,2,2-三氟乙醇中的溶剂分解得到相应的4- exo-三氟乙氧基衍生物为唯一产物。四环烷酮本身与羟胺-O-磺酸发生裂解反应,选择性地以90%的分离产率提供4 - exo - hydroxy -6- endo - nitrile。