Cobalt-catalyzed arylation and alkenylation of alpha-bromo eneformamides and enecarbamates by cross-coupling with organic bromides: Application to the synthesis of functionalized piperidines and azepanes
作者:Daniel P. Bassler、Amir Alwali、Laura Spence、Oliver Beale、Timothy K. Beng
DOI:10.1016/j.jorganchem.2015.01.001
日期:2015.3
α-arylated and alkenylated piperidine and azepane derivatives has been accomplished through cross-coupling of α-bromo eneformamides or enecarbamates with feedstock organic halides such as aryl and vinyl bromides, under cobalt catalysis. The coupling products, which themselves are synthetic intermediates for accessing other functionalized piperidines and azepanes are obtained in good to excellent yields
Expedient access to α,β-difunctionalized azepenes using α-halo eneformamides: application to the one-pot synthesis of 2-benzazepanes
作者:Daniel P. Bassler、Laura Spence、Amir Alwali、Oliver Beale、Timothy K. Beng
DOI:10.1039/c4ob02183e
日期:——
The regioselective synthesis of α,β-difunctionalized (alkenyl, aryl, sulfonyl, allyl, or alkynyl) azepenes has been accomplished through α-halo eneformamides.
Direct access to functionalized benzotropones, azepanes, and piperidines by reductive cross-coupling of α-bromo enones with α-bromo enamides
作者:Timothy K. Beng、Kayla Sincavage、Ann Wens V. Silaire、Amir Alwali、Daniel P. Bassler、Laura E. Spence、Oliver Beale
DOI:10.1039/c5ob00517e
日期:——
The synthesis of functionalized azepenes and piperidines bearing an α-cycloheptenone or benzotropone derivative has been accomplished through direct reductive cross-coupling of α-bromo eneformamides or enecarbamates with highly versatile α-bromo benzotropone derivatives, under cobalt catalysis. The coupling products have been further elaborated to other synthetically useful aza-heterocyclic frameworks
Skeletal remodelling of α-substituted cyclic eneformamides to α-ketonyl cyclic amines
作者:Timothy K. Beng、Jorge Garcia、Meagan Smith、Alexis O. Orellana
DOI:10.1039/d0nj02768e
日期:——
A modular dehomologation strategy, which skeletally remodels cyclic α-substituted eneformamides to one-carbon shorter α-ketonyl saturatedcyclicamines is described. The approach hinges on N-iodosuccinimide-assisted C–halogen bond formation followed by C–N bond cleavage to arrive at α-iodo ketones, which undergo base-mediated cyclization. An intramolecular C(sp3)–H amination of in situ-generated N-iodo