Enantioselective synthesis of 2-benzyloxy alcohols and 1,2-diols via alkylation of chiral glycolate imides. A convenient approach to optically active glycerol derivatives
作者:Giuliana Cardillo、Mario Oren、Marta Romero、Sergio Sandri
DOI:10.1016/0040-4020(89)80148-6
日期:1989.1
The alkylation of the chiral enolates of glycolate imides 2a and 2b proceedes in highly diastereoselective manner to give 2'-substituted products in good yield. Reductive cleavage with LiBH4 affords the corresponding 2-benzyloxyalcohols 3a-c and 11a-b which are successively converted to 1,2-diols in high optical purity. By this method (R)-1-propanoyloxy-2, 3-propanediol 9 and (S)-1-tridecyloxy-2,3-propanediol
乙醇酸酯酰亚胺2a和2b的手性烯酸酯的烷基化以高度非对映选择性的方式进行,以高收率得到2′-取代的产物。用LiBH 4还原裂解得到相应的2-苄氧基醇3a-c和11a-b,它们以高光学纯度连续转化为1,2-二醇。通过这种方法,从2a和2b开始合成了从海绵Plocamiidae提取的甘油酯(R)-1-丙酰氧基-2、3-丙二醇9和(S)-1-十三烷氧基-2,3-丙二醇14,分别。