Cyclopent-2-en-1-ones from [3+2]-annulation of 3-ethoxycarbonyl-2-propenylidene(triphenyl)-phosphorane and glyoxals: Synthesis of cis-jasmone
作者:Md.Saiful Islam、Tomikazu Kawano、Minoru Hatanaka、Ikuo Ueda
DOI:10.1016/0040-4039(96)01213-0
日期:1996.8
[3+2]-annulation reaction in the presence of a base. Compounds 6 were easily converted to 2-substituted cyclopent-2-en-1-ones by deethoxycarbonylation. An application of the annulation to synthesis of cis-jasmone is also described.
3-乙氧基羰基-2-丙烯(三苯基)亚膦酸酯(2)与乙二醛一水合物(5)反应,在[3 + 2]-环化反应中,生成2-取代的5-乙氧基羰基环戊-2-烯-1-酮(6)。基地的存在。化合物6通过脱乙氧基羰基化容易地转化为2-取代的环戊-2-烯-1-酮。还描述了该成环法在顺式-茉莉酮合成中的应用。