Total Synthesis of <i>e</i><i>nt</i>-Cholesterol via a Steroid C,D-Ring Side-Chain Synthon
作者:Xin Jiang、Douglas F. Covey
DOI:10.1021/jo025535k
日期:2002.7.1
7a-hexahydro-7a-methyl-5H-inden-5-one, C,D ring-side chain synthons that can be used for the synthesis of enantiomers of vitamin D(3), cholesterol, and their analogues was also developed. Using the enantiomer of the C,D-ring side-chain synthon that leads to ent-cholesterol, the A- and B-rings were elaborated from a linear fragment that is sequentially cyclized to form the steroid B- and A-rings. Using
胆固醇的两种对映异构体中的一种(对-胆固醇)首次通过合成途径合成,该途径从含有D环和胆固醇整个侧链的前体开始。作为已报道的合成路线的一部分,一种普遍使用的方法可用于大规模(> 10 g)制备[1α(R *),7aα] -1-(1,5-二甲基己基)-1对映体,2,3,6,7,7a-六氢-7a-甲基-5H-茚满-5-一,C,D环侧链合成子,可用于合成维生素D(3),胆固醇的对映异构体,还开发了它们的类似物。使用导致对胆固醇的C,D环侧链合成子的对映体,从线性片段中精制A环和B环,然后将其线性环化以形成类固醇B环和A环。使用此路线,