Tandem Carbene Insertion-Semipinacol Rearrangement of 1-Alkynylcyclobutenols: A Facile Synthesis of 2-Alkenyl-4-cyclopentene-1,3-diones
作者:Metin Zora、James W. Herndon
DOI:10.1021/jo00083a002
日期:1994.2
Reaction of chromium carbene complexes and 1-alkynylcyclobutenols leads to 2-alkenyl-4-cyclopentene-1,3-diones. Initial allkyne insertion affords a highly electrophilic carbene complex, which then undergoes an alkyl shift-ring expansion, ultimately producing 2-alkenyl-4-cyclopentene-1,3-diones.