Synthesis of Halogenated α,β-Unsaturated γ-Butyrolactone Derivatives by Triphenylphosphine-Catalyzed Cyclization of α-Halogeno Ketones with Dialkyl Acetylenedicarboxylates (=Dialkyl But-2-ynedioates)
作者:Sakineh Asghari、Ahmad Khabbazi Habibi
DOI:10.1002/hlca.201100376
日期:2012.5
A Ph3P‐catalyzed cyclization of α‐halogeno ketones 2 with dialkyl acetylenedicarboxylates (=dialkyl but‐2‐ynedioates) 3 produced halogenatedα,β‐unsaturated γ‐butyrolactone derivatives 4 in good yields (Scheme 1, Table). The presence of electron‐withdrawing groups such as halogen atoms at the α‐position of the ketones was necessary in this reaction. Cyclization of α‐chloro ketones resulted in higher