Unexpected reactivity of diaryl α-diketones with thiazolium carbenes: discovery of a novel multicomponent reaction for the facile synthesis of 1,4-thiazin-3-ones
作者:Valerio Bertolasi、Olga Bortolini、Adelaide Donvito、Giancarlo Fantin、Marco Fogagnolo、Pier Paolo Giovannini、Alessandro Massi、Salvatore Pacifico
DOI:10.1039/c2ob25928a
日期:——
Diaryl α-diketones do not undergo polarity reversal in the presence of (benzo)thiazolium carbenes but are engaged in a novel multicomponent reaction with water to efficiently give medicinally relevant 1,4-thiazin-3-one heterocycles. Three different sets of conditions have been optimized to furnish the title compounds in fair to excellent yields depending on the electronic properties of α-diketone aromatic
在(苯并)噻唑鎓卡宾存在的情况下,二芳基α-二酮不会发生极性反转,但会与 水有效地提供医学上相关的1,4-噻嗪-3-一杂环。优化了三套不同的条件,以根据α-二酮芳族取代基和噻唑鎓或苯并噻唑鎓底物的电子性质,以公平的价格提供优异收率的标题化合物。基于假定的关键中间体和同位素标记实验的分离和表征,还提出了合理的反应机理。