A general synthetic route towards γ- and δ-lactones. Total asymmetric synthesis of (−)-muricatacin and the mosquito oviposition pheromone (5R,6S)-6-acetoxy-hexadecanolide
作者:Elias A. Couladouros、Anastasia P. Mihou
DOI:10.1016/s0040-4039(99)00895-3
日期:1999.6
Five (or six) membered asymmetric lactones are synthesized from γ-butyrolactone (or δ-valerolactone) in a straightforward way using the following reaction sequence: reduction, Wittig-Schlosser coupling, Sharpless asymmetric dihydroxylation, oxidation and lactonization. Thus, (−)-muricatacin is synthesized in six steps (43 % overall yield). Furthermore, (5R,6s)-6-acetoxy-hexadecanolide is prepared in
五个(或六个)成员不对称内酯是由γ-丁内酯(或δ-戊内酯)通过以下反应顺序直接合成的:还原,Wittig-Schlosser偶联,Sharpless不对称二羟基化,氧化和内酯化。因此,分六个步骤合成了(-)-莫里卡他星(总产率为43%)。此外,利用新颖的内酯化和立体化学的转化,通过碳酸酯分八步(总收率38%)制备了(5 R,6 s)-6-乙酰氧基-十六烷化物。