Preparation of various enantiomerically pure (benzotriazol-1-yl)- and (benzotriazol-2-yl)-alkan-2-ols
作者:Beata K. Pchelka、André Loupy、Alain Petit
DOI:10.1016/j.tetasy.2006.08.019
日期:2006.10
4a–6a and 4b–6b with vinyl acetate in tert-butyl methyl ether or toluene at 23 °C. The enantioselectivity of this transformation was dependent on the length of the alkyl chain with E-values ranging from 30 to 57. Several benzotriazole substituted ketones 1a–3a and 1b–3b were synthesized from 1H-benzotriazole and corresponding haloketones. These compounds were stereoselectively reduced with Baker’s yeast
(S)-(-)-(Benzotriazol-1-yl)-和(S)-(-)-(benzotriazol-2-yl)-alkan-2-ols 7a - 9a,7b - 9b及其(R) -(+)-乙酸盐10a – 12a和10b – 12b通过荧光假单胞菌(Amano AK)的脂肪酶以高对映体过量的形式制备,其中乙酸叔丁酯催化外消旋醇4a – 6a和4b – 6b的对映选择性乙酰化。-丁基甲基醚或甲苯,在23°C下。该转化的对映选择性取决于E值为30至57的烷基链的长度。由1 H-苯并三唑和相应的卤代酮合成了数个苯并三唑取代的酮1a – 3a和1b – 3b。在水中或含有5%v / v的水的有机溶剂中,在30°C下用贝克酵母将这些化合物进行立体选择性还原,得到(S)-(-)-醇。在外消旋醇4a - 6a和4b - 6b的动力学拆分中观察到更好的立体选择性(ee = 69–92%,转化率为44–5