A new domino reaction of N-alkoxy(arylmethyl)amines to N-alkyl arylamines, consisting of three types of reactions: elimination of alcohol, rearrangement of the aryl group, and addition of an organolithium or a magnesium reagent, has been developed for the first time.
Highlyenantioselective hydrogenation of seven-membered cyclic imines, substituted dibenzo[b,f][1,4]oxazepines, was achieved, with up to 94% ee, by using the [Ir(COD)Cl](2)/(S)-Xyl-C(3)*-TunePhos complex as the catalyst in the presence of morpholine-HCl.
Late-Stage Two-Step C11─H Arylation of Dibenzooxa/thiazepines
作者:Yang Chen、Mengyao Ma、Hongguang Du、Jiaxi Xu、Zhanhui Yang
DOI:10.1055/a-2038-2323
日期:——
A practical and efficientsynthesis of 11-aryldibenzooxa/thiazepines is achieved, via a late-stage and two-step C11–H arylation of simple dibenzooxa/thiazepines. The adoption of Grignard addition and DDQ dehydrogenation allows for operationally simple and chemically reliable, step-efficient, and high-yielding transformations. The two-step and one-pot procedures provide excellent yields. The gram-scale