Synthesis of 3?-Hydroxy[21-14C]-5?-pregn-8(14)-en-20-one from Chenodeoxycholic Acid
作者:M�Nica E. Deluca、Alicia M. Seldes、Eduardo G. Gros
DOI:10.1002/hlca.19860690810
日期:1986.12.10
3β-Hydroxy[21-14C]5β-pregn-8(14)-en-20-one (17) was prepared fromchenodeoxycholicacid (1a). The synthetic sequence involved: (i) degradation of the bile-acid side chain to an etianic acid; (ii) formation of the 8(14)-double bond; (iii) inversion of the configuration at C(3); (iv) construction of the acetyl side chain at C(17) with the required isotopic label at C(21). Structures of all described