A procedure was developed for preparation of previously unknown 13-aza-14-o
xa- and 13,13-diazaprostanoids proceeding from 2-(omega -methoxycarbonylalk
anoyl)cyclopentane-1,3-diones that comprised the transformation of the ment
ioned beta -triketones effected by diazomethane into 3-methoxy-2-(omega -me
thoxycarbonylalkanoyl)-2-cyclopenten-1-ones and further vinylog substitutio
n of the enol ethers obtained with amyloxyamine or phenylhydrazine.