Yaragorla S, Khan T. An unexpected thermal-ring-rearrangement of benzochromenes to inden-3-yl-naphthols with pTsOH.
Org Biomol Chem 2018;
16:7920-7925. [DOI:
10.1039/c8ob02264j]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Described here is the first report of an unexpected thermal-ring rearrangement (TRR) of benzochromenes to indene derivatives promoted by pTsOH, which proceeds through the protonation of benzochromenes by an acid catalysts followed by ring-opening and ring-closure by an intramolecular Friedel–Crafts cyclization.
Collapse