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
The a-type rotational spectrum of isocyanamide was observed in the frequency range 147–300 GHz. Ether extraction of the hydrolysis products of diazomethyllithium was employed to isolate the isocyanamide. 53 rotational lines were assigned to molecules in the ground vibrational state (NH2-inversion state 0+) and in the lowest excited vibrational state (NH2-inversion state 0−.