作者:Roland U. Braun、Markus Ansorge、Thomas J. J. Müller
DOI:10.1002/chem.200600530
日期:2006.12.4
coupling of electron-deficient (hetero)aryl halides 1 and (hetero)aryl or alkenyl 1-propargyl alcohols 2 does not terminate at the stage of the expected internal propargyl alcohols, but rather gives rise to the formation of alpha,beta-unsaturated ketones 3 with a variety of acceptor substituents. This new domino reaction, a coupling-isomerization reaction (CIR), can be rationalized as a sequence of
缺电子的(杂)芳基卤化物1和(杂)芳基或链烯基1-炔丙基醇2的Sonogashira偶联不会在预期的内部炔丙基醇阶段终止,而是导致形成α,β-具有各种受体取代基的不饱和酮3。可以将这种新的多米诺反应,即偶联异构化反应(CIR),合理化为一系列快速的Pd / Cu催化的炔基化反应,然后进行缓慢的胺基催化的炔丙基醇-烯酮异构化反应。在氘代质子溶剂或选择性氘代的炔丙醇中进行CIR显示,碱催化的异构化步骤通过正式的1,3-H转移进行,且与周围溶剂的H / D交换最少。此外,