| abstract |
The invention relates to a new process for the preparation of 6α-halo-3-keto-Δ 1 ,4 -pregnadiene-derivatives in two-steps-synthesis affording directly 6α-halo-derivatives by reacting 3-keto-9β,11β-oxido-Δ 1 ,4 -pregnadiene-derivatives with a suitable acylating or etherifying agent to give the corresponding new 3-enol-derivatives which are finally halogenated by using a suitable halogenating agent. |