Microwave-Promoted Tin-Free Iminyl Radical Cyclization with TEMPO Trapping: A Practical Synthesis of 2-Acylpyrroles
摘要:
Microwave-promoted iminyl radical cyclizations can be terminated by trapping with TEMPO, affording functionalized adducts. The use of alkynes as radical acceptors delivers a range of 2-acylpyrroles in good yields. Toxic and hazardous reagents, which are frequently employed in radical reactions, are not required. The O-phenyl oxime ether substrates are constructed in a single step from readily available ketones.
Gold-Catalyzed Cycloisomerization and Diels–Alder Reaction of 1,6-Diyne Esters with Alkenes and Diazenes to Hydronaphthalenes and -cinnolines
作者:Jianming Yan、Guan Liang Tay、Cuien Neo、Bo Ra Lee、Philip Wai Hong Chan
DOI:10.1021/acs.orglett.5b01935
日期:2015.9.4
A method for the efficient preparation of hydronaphthalene and -cinnoline derivatives by Au(I)-catalyzed cydoisomerzation of 1,6-diyne esters followed by a Diels-Alder reaction with alkenes or diazenes under mild conditions at room temperature with catalyst loadings as low as 1 mol % is described.