Stereoselective synthesis of methyl branched chiral deoxypropionate units: a new route for synthesis of insect pheromone (−)-lardolure and (2R,4R,6R,8R) 2,4,6,8-tetramethylundecanoic acid
作者:J.S. Yadav、Sandip Sengupta、Nagendra Nath Yadav、D. Narasimha Chary、Ahmad Alkhazim Al Ghamdi
DOI:10.1016/j.tetlet.2012.08.112
日期:2012.10
(−)-Lardolure and (2R,4R,6R,8R)-2,4,6,8-tetramethylundecanoic acid have been synthesized via lipase catalyzed desymmetrization strategy to create two methyl chiral centers. Other key steps involved in the synthesis are Wittig reaction, Evan’s asymmetric alkylation, Grignard reaction, Pd-catalyzed isomerization of primary allylic alcohol to corresponding saturated aldehyde, and PhNO/proline catalyzed
(-)-Lardolure和(2 R,4 R,6 R,8 R)-2,4,6,8-四甲基十一烷酸已通过脂肪酶催化脱对称策略合成了两个甲基手性中心。合成中涉及的其他关键步骤是Wittig反应,Evan不对称烷基化,Grignard反应,伯烯丙基醇在Pd催化下异构化为相应的饱和醛以及PhNO /脯氨酸催化MacMillanα-羟基化。