作者:Sabine Laschat、Nicolai Cramer、Angelika Baro
DOI:10.1055/s-2003-42079
日期:——
The lipase-mediated kinetic resolution of racemic scopoline [(±)-4] and 6-hydroxytropinone [(±)-7] is reported. Whereas (±)-4 is difficult to resolve due to steric hindrance of the hydroxy function, the resolution of (±)-7 with vinyl acetate as acyl donor gave alcohol (+)-7 and the corresponding acetate (-)-9 with high enantiomeric excess. In case of the optimal result of 99% ee for (+)-7 and 80% ee for (-)-9, an E-value of 35 was calculated. The preparative lipase-catalyzed resolution of (±)-7 resulted in almost enantiopure alcohol (+)-7 with >99% ee after one recrystallization.
报告了脂肪酶介导的外消旋东莨菪碱[(±)-4]和6-羟基托品酮[(±)-7]的动力学解析。(±)-4由于羟基官能团的立体阻碍而难以解析,而以乙酸乙烯酯为酰基供体解析(±)-7则可得到醇(+)-7和相应的乙酸酯(-)-9,对映体过量率很高。如果(+)-7 的最佳ee为 99%,(-)-9 的最佳ee为 80%,则计算出的 E 值为 35。在制备脂肪酶催化下,(±)-7 经过一次重结晶后,几乎得到了对映体纯度大于 99% 的(+)-7 醇。