A General Synthesis of Dihydronaphthyridinones with Aryl-Substituted Quaternary Benzylic Centers

J Org Chem. 2023 Mar 3;88(5):3340-3345. doi: 10.1021/acs.joc.2c02956. Epub 2023 Feb 15.

Abstract

A variety of 7,8-dihydro-1,6-naphthyridin-5(6H)-ones and 3,4-dihydro-2,7-naphthyridin-1(2H)-ones with quaternary centers and aryl substitutions at the benzylic carbon were synthesized with a new 3-step, 2-pot method. The first step is an SNAr using widely available 2- and 4-chloronicotinate esters and tertiary benzylic nitriles. The last two steps are a one-pot selective nitrile reduction in the presence of various heterocycles followed by a lactam ring closure of the free amine on the ester.