A Practical Asymmetric Synthesis of <i>trans</i>-4,5-Benzhydrindan-1-ones as a Precursor of A-Nor B-Aromatic Steroidal Compounds
作者:Yuji Matsuya、Seiji Masuda、Takakatsu Itoh、Taiki Murai、Hideo Nemoto
DOI:10.1021/jo051060w
日期:2005.8.1
enantio-controlled synthesis of trans-4,5-benzhydrindan-1-ones was achieved by means of a stereoselective [4+2] cycloaddition of o-quinodimethanes generated by a thermal cleavage of benzocyclobutene derivatives as a key step. The chiral substrates of the thermal reaction were synthesized by a diastereoselective Grignard addition to the chiral O-isopropylideneglyceroketones connected to a benzocyclobutene ring,
的对映体控制合成反式-4,5- benzhydrindan -1-酮是由立体选择性的手段[4 + 2]环加成实现ö -quinodimethanes由苯并环丁烯衍生物作为一个关键步骤的热裂解产生。热反应的手性底物是通过非对映选择性格氏试剂加到与苯并环丁烯环相连的手性O-异亚丙基甘油基酮上而合成的,它们是简单地由d-甘露醇作为手性来源制备的。这种方法可以为A-或B-芳族甾族化合物提供新的有效途径。