Reductive cyclization of nitrobiphenyls and nitrostyrenes to carbazoles and indoles, respectively, is carried out by triphenylphosphine under mild conditions catalyzed by a dichlorodioxomolybdenum(VI) complex. A one‐pot procedure for the synthesis of regioselectively functionalized indoles has been developed from commercially available o ‐nitrobenzaldehydes and phosphoranes.
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Sanz et al. (2007) studied this question.
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