16-ALKYLATED CORTICOIDS. II. 9α-FLUORO-16α-METHYLPREDNISOLONE 21-ACETATE<sup>1</sup>
作者:Eugene P. Oliveto、Richard Rausser、Lois Weber、A. L. Nussbaum、William Gebert、C. Thomas Coniglio、E. B. Hershberg、S. Tolksdorf、Milton Eisler、P. L. Perlman、M. M. Pechet
DOI:10.1021/ja01549a090
日期:1958.8
Improved method of obtaining 16α-methyl-5α-pregnane-17α,21-diol-3,20-dione, a dexamethasone intermediate
作者:G. S. Grinenko、N. P. Sorokina
DOI:10.1007/bf00765387
日期:1981.10
Replacement of the 21-bromine in (II) by an acetoxygroup was effected under homogeneous conditions, as described for other steroids in [5], by the action of triethylamine and acetic acid in acetone solution. Reaction time was reduced by half in comparison with literature data [3, 4] where acetoxylation at position 21 was described under heterogeneous conditions in DMF (dimethylfo•namide) or in acetone