An efficient, chemoselective homologation of Weinreb amides to the corresponding variously substituted [small alpha]-oxyketones has been developed via the addition of lithiated [small alpha]-oxygenated species. This one-step, experimentally easy, high yielding protocol...
Efficient One-Pot Multifunctionalization of Alkynes en Route to α-Alkoxyketones, α-Thioketones, and α-Thio Thioketals by using an Umpolung Strategy
作者:Zhou Xu、Rongliang Zhai、Ting Liang、Liming Zhang
DOI:10.1002/chem.201703087
日期:2017.10.12
All topsy turvy: A new and broadly applicable method for the synthesis of unique α-oxygenated ketones, α-thio ketones and α-thio thioketals via umpolung reaction of nucleophiles-alcohols/thioalcohols and N-alkenoxypyridinium salts generated from alkynes in a one-pot manner is reported for the first time. The reaction is controllable and tunable with good substrates scope (46 examples) and excellent