Alkyl aldehyde carbene source

Diazo-free, mild cyclopropanation

Uses alkyl aldehydes as carbene precursors activated by ligated boryl radicals, avoiding diazo compounds and enabling efficient cyclopropanation of alkenes.

Liang, Bin · Yang, Chao · Xia, Wujiong · Guo, Lin

Journal of the American Chemical Society 2025

Advantages

Broad substrate scope, >88 examples

Mild conditions, good functional group tolerance