Silver(I)-mediated oxidation/cyclization of acrylamides with alkyl trifluoroborates
作者:Siyi Ding、Huaping Ren、Min Zhu、Qiang Ma、Zongcheng Miao、Pengfei Li
DOI:10.1080/00397911.2020.1846057
日期:2021.2.16
A mild silver-mediated oxidative cyclization of acrylamides has been developed by using alkyltrifluoroborates as radical precursors. It proceeds through a tandem radical addition/cyclization proce...
visible-light-induced deboronative alkynylationreaction, which is redox-neutral and works with primary, secondary and tertiary alkyl trifluoroborates or boronic acids to generate aryl, alkyl and silyl substituted alkynes. This reaction is highly chemoselective and performs well on substrates containing alkenes, alkynes, aldehydes, ketones, esters, nitriles, azides, aryl halides, alkyl halides, alcohols
ABSTRACT A rapid and highly efficient method for the radical formation using potassium alkylfluoroborates as radical precursor is devised and developed which conducts under relatively mild condition using silver(I) oxide as the oxidant. The observed silver mirror phenomenon hints at the fact that Ag2O is the real oxidant. This approach effectively overcomes the drawbacks-stringent reaction conditions
Selective C−N Borylation of Alkyl Amines Promoted by Lewis Base
作者:Jiefeng Hu、Guoqiang Wang、Shuhua Li、Zhuangzhi Shi
DOI:10.1002/anie.201809608
日期:2018.11.12
synthesize various alkyl potassium trifluoroborate salts is introduced. The key to this high reactivity is the utilization of pyridinium salt activated alkylamines, with a catalytic amount of a bipyridine‐type Lewis base as a promoter. This transformation shows good functional‐group compatibility (e.g., it is unimpeded by the presence of a ketone, indole, internal alkene, or unactivated alkyl chloride) and
including chloro, bromo, ester, ketone, and amide. Additionally, it is not sensitive to steric hindrance. Thus, this reaction represents a very useful strategy for the production of 6-alkylated phenanthridine derivatives. The addition of alkyl radical to the isonitrile, followed by a radical aromatic cyclization, is involved in this transformation.