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- W2744495393 abstract "Umpolung Amide Synthesis (UmAS) has emerged as a superior alternative to conventional amide synthesis methods based on carbonyl electrophiles in a range of situations, particularly when epimerization-prone couplings are prescribed. In an unanticipated development during our most recent studies, we discovered that diacyl hydrazide products from UmAS were not formed as intermediates when using an acyl hydrazide as the amine acceptor. This resulted in a new preparation of 1,3,4-oxadiazoles from α-bromonitroalkane donors. We hypothesized that a key tetrahedral intermediate in UmAS was diverted toward a more direct pathway to the heterocycle product rather than through formation of the diacyl hydrazide, a typical oxadiazole progenitor. In studies reported here, diversion to 1,2,4-triazole products is described, a behavior hypothesized to also result from an analogous tetrahedral intermediate, but one formed from heteroaromatic hydrazine acceptors." @default.
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- W2744495393 date "2017-08-07" @default.
- W2744495393 modified "2023-09-24" @default.
- W2744495393 title "1,3,4-Oxadiazole and Heteroaromatic-Fused 1,2,4-Triazole Synthesis Using Diverted Umpolung Amide Synthesis" @default.
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- W2744495393 doi "https://doi.org/10.1055/s-0036-1590802" @default.
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