Synthesis of some carbazolequinone alkaloids and their analogues. Facile palladium-assisted intramolecular ring closure of arylamino-1,4-benzoquinones to carbazole-1,4-quinones.
convenient synthesis of carbazole-1,4-quinone alkaloid koeniginequinones A and B using a tandem ring-closing metathesis with the dehydrogenation reaction sequence under an O2 atmosphere as an important step. Using this method, carbazole-1,4-quinones substituted at the 5-, 6-, 7-, and/or 8-positions have been synthesized. Moreover, 24 compounds, including koeniginequinones A and B, have been evaluated for
Synthesis of murrayaquinone A and analogues via ring-closing C–H arylation
作者:Robin B. Bedford、John G. Bowen、Amanda L. Weeks
DOI:10.1016/j.tet.2013.02.055
日期:2013.6
A compact synthesis of Murrayaquinone A is reported, based on sequential Buchwald-Hartwig amination/annulative C-H activation followed by oxidation of the intermediate carbazole. The methodology can be readily extended to other analogues with electron-rich quinone rings. (C) 2013 Elsevier Ltd. All rights reserved.
YOGO, MOTOI;ITO, CHIHIRO;FURUKAWA, HIROSHI, CHEM. AND PHARM. BULL., 39,(1991) N, C. 328-334