Multiple roles of aryloxide leaving groups in enantioselective annulations employing α,β-unsaturated acyl ammonium catalysis
作者:Mark D. Greenhalgh、Shen Qu、Alexandra M. Z. Slawin、Andrew D. Smith
DOI:10.1039/c8sc01324a
日期:——
addition–annulation process using β-fluoroalkyl-substituted α,β-unsaturated aryl esters and a range of 2-acylbenzazoles is reported for the enantioselective synthesis of dihydropyranone and dihydropyridinone products bearing polyfluorinated stereocenters (29 examples, up to 98% yield, >99 : 1 er). The choice of aryl group of the aryl ester proved essential in determining reaction enantioselectivity and dihyd
Non-bonding 1,5-S⋯O interactions govern chemo- and enantioselectivity in isothiourea-catalyzed annulations of benzazoles
作者:Emily R. T. Robinson、Daniel M. Walden、Charlene Fallan、Mark D. Greenhalgh、Paul Ha-Yeon Cheong、Andrew D. Smith
DOI:10.1039/c6sc00940a
日期:——
Isothiourea-catalyzed annulations of 2-acyl benzazoles and α,β-unsaturated acyl ammoniums are tuned to form lactams or lactones (up to 99% ee). Computations highlight the governing roles of S⋯O and CH⋯O interactions.
Enantioselective Synthesis in Continuous Flow: Polymer-Supported Isothiourea-Catalyzed Enantioselective Michael Addition–Cyclization with α-Azol-2-ylacetophenones
作者:Zhanyu Zhou、Kevin Kasten、Tengfei Kang、David B. Cordes、Andrew D. Smith
DOI:10.1021/acs.oprd.4c00113
日期:2024.5.17
incorporating a polymer-supported isothiourea HyperBTM catalyst derivative has been used to promote the enantioselective synthesis of a range of heterocyclic products derived from α-azol-2-ylacetophenones and -acetamides combined with alkyl, aryl, and heterocyclicα,β-unsaturated homoanhydrides in continuous flow via an α,β-unsaturated acyl-ammonium intermediate. The products are generated in good to