Lipase-catalysed kinetic resolution as the key step in the synthesis of a new class of optically active 5,6-trans-9,10-dihydrophenanthroline derivatives
作者:Claudia Sanfilippo、Giovanni Nicolosi
DOI:10.1016/j.tetasy.2008.09.010
日期:2008.9
New atropisomeric 5,6-trans-9,10-dihydrophenanthroline amino- and hydroxy-derivatives 3–7 possessing two additional stereogenic centres were obtained in high enantiomeric purity by lipase-catalysed kinetic resolution of the corresponding easily accessible racemates. Lipase from Pseudomonas fluorescens (Lipase AK) showed good enantioselectivity (E > 200) in the esterification reaction of trans-5-azido-6-hydroxyl
新阻转5,6-反式-9,10- dihydrophenanthroline氨基-和羟基-衍生物3 - 7具有由相应的容易接近消旋物的脂肪酶催化的动力学拆分在高对映体纯度获得附加两个立体中心。荧光假单胞菌的脂肪酶(Lipase AK) 在反式-5-叠氮基-6-羟基衍生物(±)-7的酯化反应中表现出良好的对映选择性(E > 200),从而获得对映体(+)-和(-) -分离出7个,ee分别为97%和ee> 98%。叠氮化物基团的化学还原提供了同手性氨基衍生物(+)-和(-)-4而对映体纯度没有损失。对于所研究的所有底物,脂肪酶AK揭示具有(P,R,R)-构型的对映异构体的立体偏好。