Synthetic methods were studied for optically active 6-oxo-3,5-isopropylidenedioxyhexanoate esters (4), which could be used as a key precursor of various kinds of artificial analogs of 3-hydroxy-3-methylglutaryl coenzyme A (HMG-CoA) reductase inhibitors. An enantiomer (+)-4 was prepared by asymmetric reduction of β,δ-diketo esters derived from the Taber’s alcohol or l-tartrate followed by a series of chemical transformations, and the desired enantiomer (−)-4 was prepared by the same asymmetric reduction starting from d-tartrate. The key intermediate (−)-4 was finally converted into a highly potent HMG-CoA reductase inhibitor, NK-104.
研究了合成光学活性6-氧代-3,5-异丙基二氧六酸酯(4)的方法,这些化合物可作为各种人工类3-羟基-
3-甲基戊二酸酰
辅酶A(
HMG-CoA)还原酶
抑制剂的关键前体。通过对来自塔贝
酒精或l-
酒石酸盐的β,δ-二
酮酯进行不对称还原,制备了对映异构体(+)-4,随后经过一系列
化学转化,最终得到所需的对映异构体(−)-4,并通过相同的不对称还原方法从d-
酒石酸盐出发制得。关键中间体(−)-4最终转化为一种高效的
HMG-CoA还原酶
抑制剂NK-104。