Tryniszewski M, Bujok R, Cmoch P, Gańczarczyk R, Kulszewicz-Bajer I, Wróbel Z. Direct Reductive Cyclocondensation of the Nitro Group with the Amido Group: Key Role of the Iminophosphorane Intermediate in the Synthesis of 1,4-Dibenzodiazepine Derivatives.
J Org Chem 2019;
84:2277-2286. [PMID:
30707024 DOI:
10.1021/acs.joc.8b02682]
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Abstract
A class of dialkylamino-substituted dibenzodiazepines and their hetero analogues was synthesized by the intramolecular aza-Wittig condensation of the amido group with iminophosphoranes. The one-pot, two-step procedure includes reductive synthesis of the intermediate iminophosphoranes from the corresponding nitroamides and tributylphosphine.
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