Readily available 1‐sulfonyl‐1,2,3‐triazoles were converted into α‐imino carbenes in the presence of catalytic amounts of rhodium(II) salts. The carbenes underwent a tandem reaction with salicylaldehydes to provide a series of functionalized 2,5‐epoxybenzo[ f ][1,4]oxazepines in high yields.
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Shi et al. (2015) studied this question.
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