Dehydration and solvolysis products from glycyrrhetic acid
作者:M.H.A. Elgamal、M.B.E. Fayez
DOI:10.1016/s0040-4020(01)82561-8
日期:1967.1
Dehydration of methyl glycyrrhetate (VI) and β-amyrin with PCl5 and with Fuller's earth afforded ring-A contracted products in which double bond migrations may occur. HI-induced dehydration of VI afforded a conjugated enonene 18α derivative. Solvolysis of VI sulphonate esters under a variety of conditions gave a number of ring-A contracted and uncontracted products in which the new ethenoid linkage