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
Direct oxidation of bromo-derived Fischer–Borsche oxo-ring using molecular iodine with combined experimental and computational study
作者:Vivek T. Humne、Monica H. Ghom、Mahavir S. Naykode、Yuvraj Dangat、Kumar Vanka、Pradeep Lokhande
DOI:10.1039/d2ob00793b
日期:——
direct oxidation of the bromo-derived Fischer–Borsche oxo-ring leading to carbazolequinone has been developed by usingmoleculariodine. This unprecedented transformation has been used for the modular synthesis of the anti-cardiotonic agent murrayaquinone. Furthermore, the present method has been generalized to a broad range of functional groups, with good to excellent yield.