related natural products based on Barton–Zard reaction of nitrostilbenes with ethyl isocyanoacetate was developed. Treatment of diarylpyrrole‐2‐carboxylates with 1 equiv. of. BBr3 resulted in selective O‐demethylation of the ortho‐methoxy group, while other methoxy groups remained intact. Subsequent base‐induced lactonization provides the target pyrrolocoumarins.
基于
亚硝基苯与
异氰基乙酸乙酯的Barton-Zard反应,开发了一种无
金属方法制备薄片蛋白和相关
天然产物的
吡咯香豆素核的方法。1当量处理二芳基
吡咯-2-羧酸酯。的。BBr 3导致邻甲氧基的选择性O-去甲基化,而其他甲氧基保持完整。随后的碱基诱导的内酯化提供了目标
吡咯香豆素。