Bentley et al., Journal of the Chemical Society, 1955, p. 596,600
作者:Bentley et al.
DOI:——
日期:——
Higher isoprenoids—IV
作者:A.S. Narula、Sukh Dev
DOI:10.1016/0040-4020(73)80011-0
日期:1973.1
By a 12-step sequence of reactions (24 S)-9β,19-cyclo-14α,24-dimethyl-cholest-4-en-3-one (14) has been obtained from cyclolaudenol (4) in overall yields of 8%. This sequence of reactions includes a new procedure for the expansion of the A-nor-3-oxo-derivative 10 to the above α,β-unsaturated ketone (14). A case of facile ring-opening of the 9,19-cyclopropane moiety has been observed. An interesting