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• W2035265176 abstract "A Pd-catalyzed method for the preparation of N-aryl benzophenone hydrazones 4 is described. The use of a Pd/BINAP-based catalyst provides hydrazones 4 in good yields. Using 0.1 mol % of a Pd/9,9-dimethyl-4,5-bis(diphenylphosphino)xanthene (Xantphos) catalyst, the desired hydrazones are produced in excellent yields. The N-aryl benzophenone hydrazones are converted to indole products via an in situ hydrolysis/Fischer cyclization protocol. A procedure that extends this methodology to the synthesis of N-alkylindoles via the intermediacy of N-aryl-N-alkyl benzophenone hydrazones is described. Additionally, the Pd-catalyzed preparation of diaryl benzophenone hydrazones, followed by a hydrolysis/Fischer cyclization protocol, affords N-arylindole products in good yields. This methodology provides a means for the preparation of a structurally diverse set of indoles from simple, (usually) commercially available precursors." @default.
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• W2035265176 date "1999-10-22" @default.
• W2035265176 modified "2023-10-16" @default.
• W2035265176 title "A Palladium-Catalyzed Method for the Preparation of Indoles via the Fischer Indole Synthesis" @default.
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• W2035265176 doi "https://doi.org/10.1021/ja992077x" @default.
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