Unexpected Ring Contraction of Homophthalic Anhydrides under Diazo Transfer Conditions.
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DOI: 10.1021/acs.orglett.2c01730
Abstract: An attempted Regitz diazo transfer onto homophthalic anhydride led to the discovery of an unexpected ring contraction, which gave N-sulfonyl phthalide-3-carboxamide derivatives. The reaction is thought to proceed via a [3 + 2] cycloaddition of… read more here.
Keywords: ring contraction; diazo transfer; unexpected ring; contraction homophthalic ... See more keywords