New synthesis of steroidal tetrahydro-oxazin-2-ones
Abstract
In dimethyl sulphoxide–NaHCO3, 16α-aminomethyl- and 16α-benzylaminomethyl-3-methoxy-17β-tosyloxyestra-1,3,5(10)-triene undergo cyclisation into the corresponding tetrahydro-oxazin-2-ones instead of oxidation.