Introducing a New Class of N-Phosphoryl Ynamides via Cu(I)-Catalyzed Amidations of Alkynyl Bromides
摘要:
We describe here the first synthesis of N-phosphoryl ynamides featuring C- and P-chirality via copper(I)-catalyzed amidative cross-couplings between phosphoramidates and phosphordiamidates with alkynyl bromides. Also featured is a tandem aza-Claisen-hetero-[2 + 2] cycloaddition for the synthesis of N-phosphoryl azetidin-2-imines.
Carbocyclization Cascades of Allyl Ketenimines via <i>Aza-</i>Claisen Rearrangements of <i>N-</i>Phosphoryl-<i>N-</i>allyl-ynamides
作者:Kyle A. DeKorver、Xiao-Na Wang、Mary C. Walton、Richard P. Hsung
DOI:10.1021/ol300366e
日期:2012.4.6
A series of carbocyclization cascades of allyl ketenimines initiated through a thermal aza-Claisen rearrangement of N-phosphoryl-N-allyl ynamides is described. Interceptions of the cationic intermediate via Meerwein-Wagner rearrangements and polyene-type cyclizations en route to fused bi- and tricyclic frameworks are featured.