scheme1
![Catalyst-free decarboxylative alkylation: access to quaternary center](https://image.oaes.cc/ee7586b1-2604-409c-af2f-2a2061ea967a/cs3057.scheme.1.jpg)
Scheme 1. (A) Amidation reaction between amines and carboxylic acids; (B) esterification reaction between carboxylic acids and amine-derived pyridinium salts; (C) this work: decarboxylative alkylation reaction. TPT: 2,4,6-triphenylpyrylium; DMSO: Dimethyl sulfoxide; RT: room temperature.