Synthesis of C3,C4-Disubstituted Indoles via the Palladium/Norbornene-Catalyzed <i>ortho</i>-Amination/<i>ipso</i>-Heck Cyclization
作者:Alexander J. Rago、Guangbin Dong
DOI:10.1021/acs.orglett.1c01165
日期:2021.5.7
Herein, we report the synthesis of C3,C4-disubstituted indoles via the palladium/norbornene cooperative catalysis. Utilizing N-benzoyloxy allylamines as the coupling partner, a cascade process involving ortho-amination and ipso-Heck cyclization takes place with ortho-substituted aryl iodides to afford diverse indole products. The reaction exhibits good functional group tolerance, in addition to tolerating
[1,5] hydrogen shift in aza-ortho-xylylenes generated from 3-alkyl-2,1-benzisothiazoline 2,2-dioxides.
作者:Krzysztof Wojciechowski
DOI:10.1016/s0040-4020(01)80198-8
日期:1993.1
1-benzisothiazoline 2,2-dioxides 4 undergo [1,5] hydrogenshift leading to 2-aminostyrene derivatives 6. In the case of 1,3-diallylbenzosultam 7 such transformation leads to N-allylaminophenyl-1,3-butadiene 9 which cyclizes to 5,6,6a,7,8,10a-hexahydrophenanthridine 10. Cyclobutanospiro-3-benzosultams 11 after the extrusion of SO2 and the [1,5] hydrogenshift form unstable phenylcyclobutenes, which undergo