Issue 2, 2015

Simple, versatile, and chemoselective reduction of secondary amides and lactams to amines with the Tf2O–NaBH4 or Cp2ZrHCl–NaBH4 system

Abstract

The reduction of secondary amides to amines is an important transformation for the total synthesis of alkaloids and pharmaceuticals. General and chemoselective direct methods for this transformation are scarce. We report in this paper a simple method for the direct reduction of secondary amides, which uses only two reagents, triflic anhydride for amide activation, and NaBH4 for reduction. Running under mild conditions (0 °C to r.t.), the reaction works well with several types of secondary amides including aromatic amides, aliphatic amides, and α,β-unsaturated amides. The reaction displays a good functional group tolerance for a series of reducible functional groups. The method is applicable to the direct reduction of C–H lithiation-functionalization products, and C–H activation-functionalization products. Moreover, chemoselective reduction of secondary lactams has been achieved using Cp2ZrHCl–NaBH4 combination.

Graphical abstract: Simple, versatile, and chemoselective reduction of secondary amides and lactams to amines with the Tf2O–NaBH4 or Cp2ZrHCl–NaBH4 system

Supplementary files

Article information

Article type
Research Article
Submitted
02 Kax 2014
Accepted
05 Qun 2015
First published
06 Qun 2015

Org. Chem. Front., 2015,2, 150-158

Author version available

Simple, versatile, and chemoselective reduction of secondary amides and lactams to amines with the Tf2O–NaBH4 or Cp2ZrHCl–NaBH4 system

P. Huang and H. Geng, Org. Chem. Front., 2015, 2, 150 DOI: 10.1039/C4QO00317A

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