Stereoselective synthesis of (Z )-α-(alkoxycarbonyl)methylene β- and γ-lactones by palladium-catalysed oxidative carbonylation of alkynols
作者:Bartolo Gabriele、Giuseppe Salerno、Francesca De Pascali、Mirco Costa、Gian Paolo Chiusoli
DOI:10.1039/a603892a
日期:——
(Z)-α-(Alkoxycarbonyl)methylene β- and
γ-lactones can be obtained in fair to excellent yields and with
high catalytic efficiencies by PdI2/KI-catalysed oxidative
dialkoxycarbonylation of propynyl alcohols (α,α-dialkyl
substituted, or α-monoalkyl substituted with a sufficiently bulky
alkyl group) and but-3-yn-1-ols, respectively. Reactions are carried out
in alcoholic media under mild conditions (70â80 °C and
20 atm of a 3â¶1 mixture of carbon monoxide and air). Reaction
pathways are discussed.
(Z)-δ-(烷氧基羰基)亚甲基δ-和δ-内酯可分别通过 PdI2/KI 催化的丙炔醇(δ,δ-二烷基取代,或δ-单烷基被足够大的烷基取代)和丁-3-炔-1-醇的氧化二烷氧基羰基化反应,以相当好到极好的产率和较高的催化效率获得。反应在酒精介质中温和进行(70â80 °C,20 atm 的一氧化碳和空气 3â¶1 混合物)。对反应途径进行了讨论。