Microbiological hydroxylation of steroids. Part IV. The pattern of dihydroxylation of mono-oxygenated 5α-androstanes with cultures of the fungus Calonectria decora
作者:A. M. Bell、P. C. Cherry、I. M. Clark、W. A. Denny、Ewart R. H. Jones、G. D. Meakins、P. D. Woodgate
DOI:10.1039/p19720002081
日期:——
concerned with the relation between the pattern of the dihydroxylation by Calonectriadecora of mono-oxygenated 5α-androstane derivatives (mainly ketones), and the position of the oxygen function in the substrate. Terminal ring ketones (3, 4, 16, and 17) are converted, in useful yields, into one or two dihydroxy-ketones. (Ring B and C ketones are much less satisfactory as substrates.) The structures of most
Synthetic steroids. Part IV. The reaction of 3β-hydroxy-5α-cholest-1-ene and 3β-hydroxycholest-4-ene with toluene-p-sulphonyl chloride in pyridine
作者:S. B. Laing、P. J. Sykes
DOI:10.1039/j39680000421
日期:——
The reaction of 3β-hydroxy-5α-cholest-1-ene with toluene-p-sulphonylchloride in pyridine does not yield the expected Δ1-3β-toluene-p-sulphonyl ester but results directly in the production of N-(5α-cholest-1-en-3α-yl)-pyridinium tosylate (44%) and 1α,5-cyclo-5α-cholest-2-ene (22%). Similar rearrangements of the allylic alcohols androst-1-en-3β-ol and 17β-methoxyandrost-1-en-3β-ol are also reported