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Direct access to pharmaceutically attractive benzo-fused nine-membered heterocyclic alkenes 3 with a trifluoromethyl carbinol moiety was achieved via a palladium-catalyzed double-decarboxylative formal ring-expansion process from six-membered trifluoromethyl benzo[ d ][1,3]oxazinones 1 to nine-membered trifluoromethyl benzo[ c ][1,5]oxazonines 3 in the presence of vinylethylene carbonates 2 . Generation of a Pd-π-allyl zwitterionic intermediate was proposed in the catalytic cycle. The trifluoromethyl group in the benzoxazinanones 1 plays an important role throughout the transformation. Diastereoselective chemical transformations of products 3 were also demonstrated.

chemical science

Access to benzo-fused nine-membered heterocyclic alkenes with a trifluoromethyl carbinol moiety <i>via</i> a double decarboxylative formal ring-expansion process under palladium catalysis

Access to benzo-fused nine-membered heterocyclic alkenes with a trifluoromethyl carbinol moiety via a double decarboxylative formal ring-expansion process under palladium catalysis