Titov GD, Bunev AS, Urusova SV, Novikov MS, Khlebnikov AF, Rostovskii NV. Rhodium-Catalyzed Double Dearomatization of 1,2,3-Triazole-Isoxazole Dyads: Synthesis of Nonfused 1
H-1,3-Diazepines.
Org Lett 2024;
26:7828-7833. [PMID:
39240763 DOI:
10.1021/acs.orglett.4c02588]
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Abstract
A double dearomatization of dyads consisting of 1-sulfonyl-1,2,3-triazoles and 3-aryl-5-methoxyisoxazoles was applied for the efficient synthesis of nonfused 1H-1,3-diazepines. The plausible mechanism of the cascade reaction includes transformation of the 1,2,3-triazole to rhodium azavinyl carbene, the Z-selective hydride shift to form the 1-azabuta-1,3-diene moiety, rhodium-catalyzed ring contraction of the isoxazole to azirine, and pseudopericyclic four-atom ring expansion of the azirine. The synthetic utility and antiproliferative activity of the 1,3-diazepines obtained have been demonstrated.
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