Cyclization Strategies to Polyenes Using Pd(II)-Catalyzed Couplings of Pinacol Vinylboronates
作者:Robert G. Iafe、Daniel G. Chan、Jonathan L. Kuo、Byron A. Boon、Darius J. Faizi、Tomomi Saga、Jonathan W. Turner、Craig A. Merlic
DOI:10.1021/ol3020623
日期:2012.8.17
As a complement to Pd(0)-catalyzed cyclizations, seven Pd(II)-catalyzed cyclization strategies are reported. α,ω-Diynes are selectively hydroborated to bis(boronate esters), which cyclize under Pd(II)-catalysis producing a diverse array of small, medium, and macrocyclic polyenes with controlled E,E, Z,Z, or E,Z stereochemistry. Various functional groups are tolerated including aryl bromides, and applications