Synthesis of 4-Alkyl-4-alkoxybutenolides Having Unsaturated Side Chains via Chromium Carbene Complex Photochemistry: (+)-Cerulenin
作者:Tracey E. Kedar、Michael W. Miller、Louis S. Hegedus
DOI:10.1021/jo960664k
日期:1996.1.1
photochemical reaction between optically active ene carbamates and chromium alkoxycarbene complexes containing unsaturated aliphatic side chains was further developed. Although remote olefinic groups, including conjugated dienes, were tolerated, a homoallylic side chain underwent intramolecular reaction to give a strained cyclobutanone. (+)-Cerulenin was synthesized utilizing the photochemical reaction of an
进一步发展了光学活性烯氨基甲酸酯与含不饱和脂族侧链的铬烷氧基卡宾配合物之间的光化学反应。尽管容忍了包括共轭二烯在内的远端烯烃基团,但均烯丙基侧链发生了分子内反应,从而得到了应变的环丁酮。利用炔基卡宾配合物与旋光性氨基甲酸酯的光化学反应和乙烯基溴的双(β-巴豆基)卤化镍烷基化反应为关键步骤合成了(+)-Cerulenin。