Stereoselective Dynamic Cyclization of Allylic Azides: Synthesis of Tetralins, Chromanes, and Tetrahydroquinolines
作者:Matthew R. Porter、Rami M. Shaker、Cristian Calcanas、Joseph J. Topczewski
DOI:10.1021/jacs.7b11299
日期:2018.1.31
This report describes the stereoselectivesynthesis of 3-azido-tetralins, -chromanes, and -tetrahydroquinolines via a tandem allylic azide rearrangement/Friedel-Crafts alkylation. Exposure of allylic azides with a pendant trichloroacetimidate to catalytic quantities of AgSbF6 proved optimal for this transformation. This cascade successfully differentiates the equilibrating azide isomers, providing products
Aryl 2-silyloxyprop-1-yl ethers underwent intramolecular C(sp2)–H/C(sp3)–H cross-dehydrogenative coupling in the presence of Ir/(S)-DTBM-SEGPHOS catalyst. The reaction proceeded enantioselectively to afford 3-methyl-3-silyloxy-2,3-dihydrobenzfurans with up to 99% ee.