Cyclopropylcarbinyl radical-mediated ring expansion to seven-membered carbocycles
作者:Eric J. Kantorowski、Babak Borhan、Saman Nazarian、Mark J. Kurth
DOI:10.1016/s0040-4039(98)00311-6
日期:1998.4
carbocycles can be prepared from the corresponding xanthate derivatives of bicyclo[4.1.0]heptan-1-methanol. In certain systems, an intermediate cycloheptyl radical appears to be kinetically favored over the cyclohexyl radical, but the direction of cyclopropylcarbinyl radical fragmentation is subject to substitution about the bicyclo[4.1.0]heptan-1-methyl ring.
提出了自由基介导的扩环方法,其中可以由双环[4.1.0]庚基-1-甲醇的相应的黄原酸酯衍生物制备7元碳环。在某些系统中,中间环庚基自由基似乎在动力学上优于环己基自由基,但环丙基羰基自由基断裂的方向在双环[4.1.0]庚基-1-甲基环上容易被取代。