7ALPHA-HYDROXYPREGN-4-EN-3-ONE-20-CARBALDEHYDE, PROCESS FOR PRODUCING THE SAME AND PROCESS FOR PRODUCING 7ALPHA,21-DIHYDROXY-20-METHYLPREGN-4-EN-3-ONE FROM THE SAME

摘要

7 alpha -Hydroxy-pregn-4-en-3-one-20-carbaldehyde, a production method thereof and a method for producing 7 alpha ,21-dihydroxy-20-methyl-pregn-4-en-3-one, which is useful as a synthetic intermediate for pharmaceuticals such as squalamine and the like, efficiently at high purity from the carbaldehyde.