Formal and total syntheses of herbarumin I and II, respectively from (R)-2,3-cyclohexylideneglyceraldehyde
作者:Dibakar Goswami、Angshuman Chattopadhyay
DOI:10.1016/j.tetasy.2012.05.011
日期:2012.5
for the formal synthesis of herbarumin I A. Condensation of 7 with 10, another intermediate obtained from 1 afforded 11. The RCM reaction of 11 in the presence of Grubbs second generation catalyst Ru II and global debenzylation of the product in the presence of TiCl4 furnished B. The efficacy of the entire route was due to its operational simplicity, the easy accessibility of 1, all of the reactions
乙烯基格氏试剂加成到2,通过(的硝基醛醇反应得到的[R)-2,3- cyclohexylideneglyceraldehyde 1,得到3具有绝对立体选择性。将其转化为7,一种已知的中间体,用于形式上的植物素蛋白I A的正式合成。7与10的缩合反应,从1中获得的另一种中间体得到11。在Grubbs第二代催化剂Ru II存在下11的RCM反应和在TiCl 4存在下产物的整体脱苄基作用提供了B。整个路线的有效性归因于其操作简便性,1的易获得性,所有反应都是廉价的以及涉及的不对称C–C键形成反应的高立体选择性以及RCM反应的E选择性。