The dihydroindole C-ring found in CC-1065/duocarmycin analogs is formed by the 5-exo-trig radical cyclization of an aryl halide onto a tethered vinyl chloride forming with chlorine installed as a suitable leaving group for subsequent cyclopropane spirocyclization. The versatility of this approach is disclosed in the context of six CC-1065/duocarmycin analogs previously synthesized in this laboratory.
CC-1065/duocarmycin 类似物中的二
氢吲哚 C 环是通过芳基卤化物与系链
氯乙烯的 5-exo 三自由基环化反应形成的,
氯作为合适的离去基团用于随后的
环丙烷螺环化反应。本实验室以前合成的六种 CC-1065/duocarmycin 类似物揭示了这种方法的多功能性。