Some photochemical and oxidative conversions of pterocarpans and isoflavans: functional requirements for cyclization of isoflavans to pterocarpans
作者:Jaco C. Breytenbach、Jan J. van Zyl、Pieter J. van der Merwe、Gerhardus J. H. Rall、David G. Roux
DOI:10.1039/p19810002684
日期:——
9-methylenedioxy-ring system. Oxidative conversions of 2′,7-dihydroxyisoflavans to pterocarpans with 2,3-dichloro-5,6-dicyanobenzoquinone in methanol may proceed via unstable quinone methides, or via 4-carbocation intermediates after hydride abstraction. However, appropriate 2′-hydroxy-4′-methoxy-disubstitution provides the first example of selective aromatic methoxylation of the B-ring under oxidative conditions.