Enantioselective Synthesis of α-Methyl Carboxylic Acids from Readily Available Starting Materials via Chemoenzymatic Dynamic Kinetic Resolution
作者:Lisa K. Thalén、Anna Sumic、Krisztián Bogár、Jakob Norinder、Andreas K. Å. Persson、Jan-E. Bäckvall
DOI:10.1021/jo1011653
日期:2010.10.15
enantioselective method for the synthesis of α-methyl carboxylic acids starting from trans-cinnamaldehyde, a readily available and inexpensive compound, has been developed. Allylic alcohol 1 was obtained via a standard Grignard addition to trans-cinnamaldehyde. Dynamic kinetic resolution was applied to allylic alcohol 1 utilizing a ruthenium catalyst and either an (R)-selective lipase or an (S)-selective protease
已经开发了从反式肉桂醛(一种容易获得且便宜的化合物)开始合成α-甲基羧酸的对映选择性方法。通过反式肉桂醛的标准格氏试剂获得烯丙醇1。动态动力学拆分应用于烯丙基醇1利用钌催化剂和任一种([R ) -选择性脂肪酶或(小号选择性蛋白酶以高产率和高ee提供相应的烯丙基酯。然后应用铜催化的烯丙基取代,以提供相应的具有立体化学反转的烯烃。随后的C-C双键裂解可提供高ee值和高达76%的总收率的药学上重要的α-甲基取代的羧酸。