Lipase-Mediated Synthesis of Enantiopure N-Carbobenzoxy-3-hydroxy-1,2,3,4-tetrahydro- and N-Carbobenzoxy-3-hydroxy-1,2,3,6-tetrahydropyridines from 3-Hydroxypyridine
作者:Hideki Sakagami、Kunio Ogasawara
DOI:10.1055/s-2000-6363
日期:——
Two isomeric chiral hydroxytetrahydropyridines, having high potential utility for the construction of a variety of chiral amine derivatives, have been prepared in both enantiomeric forms by employing lipase-mediated resolution starting from 3-hydroxypyridine. Thus, on exposure to sodium borohydride in the presence of carbobenzoxy chloride, 3-hydroxypyridine has been found to furnish racemic N-carbobenzoxy-3-hydroxy-1,2,3,4-tetrahydropyridine, which is resolved under trans-esterification conditions in the presence of lipase PS to give both enantiomeric products in enantiopure forms. Isomerization of the chiral 1,2,3,4-tetrahydro-product into the chiral 1,2,3,6-tetrahydro-derivative has been accomplished without loss of the original chiral integrity. The racemic 1,2,3,6-tetrahydro-derivative has also been resolved under the same lipase-mediated trans-esterification conditions.
从 3-羟基吡啶开始,通过脂肪酶介导的解析,制备出了两种对映体形式的异构体手性羟基四氢吡啶,它们在制造各种手性胺衍生物方面具有很高的潜在用途。因此,3-羟基吡啶在羧基苄氧基氯的存在下接触硼氢化钠后,会生成外消旋的 N-羧基苄氧基-3-羟基-1,2,3,4-四氢吡啶,在脂肪酶 PS 的存在下,这种外消旋的 N-羧基苄氧基-3-羟基-1,2,3,4-四氢吡啶在反酯化条件下被分解,从而得到两种对映体形式的对映体产物。手性 1,2,3,4-四氢产物异构化为手性 1,2,3,6-四氢衍生物的过程中,并没有损失原有的手性完整性。在相同的脂肪酶介导的反酯化条件下,外消旋 1,2,3,6- 四氢衍生物也得到了分离。