Palladium-catalyzed synthesis of 1,3,4-alkatrien-2-yldihydrofurans from 2,3-allenylacetylacetates and propargylic carbonates and their application to synthesize polysubstituted dihydrofurylcyclopentenones
作者:Wei Shu、Shengming Ma
DOI:10.1016/j.tet.2010.02.030
日期:2010.4
and regioselective palladium(0)-catalyzed coupling–cyclization reaction of 2-(2′,3′-allenyl)acetylacetates with propargylic carbonates was reported. The reaction proceeded smoothly underneutralconditions, affording the O-attacked five-membered products with a 1,3,4-trienyl substituent exclusively in good to excellent yields. The products can be efficiently applied to the synthesis of polysubstituted
Electrophilic Cyclization of 2-(2′,3′-Allenyl)acetylacetates with Iodine Using Calcium Hydride as the Base
作者:Baoqiang Wan、Xuefeng Jiang、Guochen Jia、Shengming Ma
DOI:10.1002/ejoc.201200527
日期:2012.8
A facile and efficient protocol for the synthesis of 4,5-dihydrofuran derivatives via iodine-mediated cyclization of various 2-(2′,3′-allenyl)acetylacetates with CaH2 as the base has been developed. The yields range from moderate to good. The resulting products can be used for further elaboration by palladium-catalyzed coupling reactions.