作者:Guobi Chai、Youai Qiu、Chunling Fu、Shengming Ma
DOI:10.1021/ol202076c
日期:2011.10.7
Chromone derivatives were synthesized from 2,3-allenoic acids and benzynes in moderate to excellent yields under mild conditions. Instead of the cyclic conjugate addition of the intermediate A formed by the nucleophilic addition of allenoic acid with benzyne, this intermediate undergoes 1,2-addition with the carbonyl group, which was followed by the ring opening, conjugate addition, and protonolysis
在温和的条件下,由2,3-烯丙基酸和苯并炔以中等至极好的收率合成了色酮衍生物。取代通过烯丙基酸与苯炔的亲核加成反应形成的中间体A的环状共轭加成,该中间体与羰基进行1,2-加成,然后开环,共轭加成和质子分解得到色酮衍生品。由于2,3-烯基酸和苯炔的取代基负载能力,该协议允许多样性。