N-Heterocyclic Carbene-Catalyzed <i>in situ</i>
Activation of Alkynyl Acids for C−S Bond Formation: Access to Imidazo[2,1-<i>b</i>
][1,3]thiazinones
作者:Kewen Sun、Shiyi Jin、Jindong Zhu、Xinmiao Zhang、Maoyu Gao、Wanqi Zhang、Tao Lu、Ding Du
DOI:10.1002/adsc.201800857
日期:2018.12.3
Alkynylacids are first utilized as alkynyl acylazolium precursors through an in situactivation strategy for the efficient construction of carbon‐sulfur bond in a formal [3+3] annulation. This protocol offers a direct and rapid pathway for the synthesis of imidazo[2,1‐b][1,3]thiazinone skeleton, a useful heterocyclic class frequently found in many bioactive compounds. This reaction also has the advantages
炔酸首先通过原位活化策略用作炔基酰基la唑前体,以便在正式的[3 + 3]环空中有效构建碳硫键。该方案为合成咪唑并[2,1– b ] [1,3]噻嗪酮骨架提供了直接而快速的途径,该骨架是在许多生物活性化合物中经常发现的有用的杂环类。该反应还具有可扩展性,易于获得的材料以及在露天中易于操作的优点。