, Volume 22, Issue 4, pp 398-400

Total synthesis of sufentanil

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Sufentanil, a potent anilidopiperidine analgesic, was synthesized from a simple thiophenylethylamine via six step sequence. The key parts of this synthesis involved an efficient construction of thiophenylethylpiperidone by aminomethano desilylation-cyclization followed by Swern oxidation and a direct regioselectiveN-nucleophilic spiral epoxide cleavage with aniline promoted by Lewis acids.