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- W2037129690 abstract "Reported is an efficient and selective method for the synthesis of 2H-indazoles 3 generated by fluoride-mediated fragmentation of 1 and easily obtained sydnones 2 (see also: D. Azarifar, H. Ghasemnejad-Borsa Synthesis 2006, 1123). The sequence consists of [3+2]-dipolar cycloaddition-decarboxylation. The optimized conditions involve use of an excess of TBAF instead of CsF, which is usually the most widely used fluoride ion source for generating benzynes. The scope of this reaction was investigated with symmetrical and unsymmetrical aryne precursors as well as a variety of C3-substituted N-phenylsydnones (R = aromatics with EDGs and EWGs, alkynyl, alkyl, vinyl, and heterocycles) providing the 2H-indazoles 3 in moderate to good yields. The use of an unsymmetrical benzyne precursor afforded a regioisomeric mixture." @default.
- W2037129690 created "2016-06-24" @default.
- W2037129690 date "2010-07-22" @default.
- W2037129690 modified "2023-09-26" @default.
- W2037129690 title "Synthesis of 2H-Indazoles via [3+2]-Dipolar Cycloaddition" @default.
- W2037129690 doi "https://doi.org/10.1055/s-0030-1257855" @default.
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