A novel ring contraction: 3β-methyl-A-nor-5β-cholestan-5-ol-6-one from 3β-tosyloxy-5α-cholestane-5,6β-diol through an ene reaction of an unsaturated acyloin
A by-product of the reaction of 3β-tosyloxy-5α-cholestane-5,6β-diol with , 3β-methyl-A-nor-5β-cholestan-5-ol-6-one, is believed to arise from the intramolecularenereaction of 4,5-seco-cholest-3-en-6β-ol-5-one.