| abstract |
Described is a method for the preparation of 6-methylene steroids of general formula (I), in which X represents the CD ring system of the androstane-series or pregnane-series steroids, from steroids of general formula (II), in which X is as defined above, or from the 3-enol ethers of these steroids, and formaldehyde. The method is characterized in that the reaction is carried out in the presence of primary or secondary amines. |