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Novel androstenoarylpyrazolines were synthesized stereoselectively by the $$\hbox {BF}_{3}$$ BF 3 -induced intramolecular 1,3-dipolar cycloaddition of alkenyl hydrazones obtained from a steroidal D-seco-aldehyde with differently substituted arylhydrazines. The reaction rates were observed to be affected significantly by the electronic character of the substituents on the aromatic moiety...
Efficient synthesis of novel 16-spiroisoxazolines in the androst-5-ene series was carried out by 1,3-dipolar cycloadditions of different aryl nitrile oxides to 3 $$\upbeta $$ β -acetoxy-16-methylene-androst-5-en-17-one. During the intermolecular ring closures, the attack of the O terminus of the nitrile oxide dipole from the $$\upalpha $$ α side on C-16 predominated for steric reasons...
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