Pyridine-4-thiol and Amphoteric Analogs: Novel Protection of Aryl Bromides in Strong Alkali
作者:Wei-Min Chen、Chao Cheng、Bing-Zhou Li、Tse-Lok Ho、Zhao-Shuo Cai、Yuqiang Wang、Ping-Hua Sun
DOI:10.1002/hlca.200890219
日期:2008.11
The use of pyridine-4-thiol (PT) to preserve certain arylbromides in strongalkali is reported (Scheme 1). The presence of this additive or of some of its amphotericanalogs such as 3-hydroxypyridin-4(1H)-ones suppresses the replacement of the Br-substituent by hydroxide and alkoxide ions. A mechanistic interpretation of the effect is proposed.