The synthesis of furan-substituted allenes using conjugated ene-yne ketones as carbene source has been developed. For this reaction, bases play vital roles in controlling the reaction pathways, allowing for access to two types of allene products through trapping of different electrophiles. Mechanistically, the catalytic procedure generated a Cu (I)(2-furyl) carbene intermediate, which is subsequently followed by a migratory insertion process to ...
