Synthesis of α-Hydroxyl Amides via Direct Amidation of Lactic Acid at Solvent- and Catalyst-Free Conditions
作者:Meiying Huang、Shanshan Zhong、Mengli Xu、Yunyun Liu
DOI:10.3184/174751915x14295180195555
日期:2015.5
The efficient synthesis of α-hydroxy-amides has been achieved by the direct amidation of lacticacid using primary amines. The reactions proceed smoothly under solvent-free conditions without using any catalyst. In general, good to excellent yields of products are obtained.
Existing protocols for the boryl radical promoted dehydroxylative alkylation of α-hydroxy carboxylic acidderivatives via C−O bond cleavage require the use of expensive radical initiators and relatively harsh conditions. An improved protocol is presented that uses cheap and readily available sodium tetraphenyl borate (NaBPh4) as a boron radical source. The reaction using the photoredox catalytic system