N-arylurethane neighboring group participation during solvolysis of 3-methoxy-17-N-phenylcarbamoyloxy-16-p_tolylsulfonyloxymethylestra-1,3,5(10)-triene stereoisomers
作者:László Hackler、Gyula Schneider、Pál Sohár
DOI:10.1016/s0040-4020(01)85620-9
日期:1992.1
During alkaline methanolysis of the four stereoisomers 1–4 of 3-methoxy-17-N-phenylcarbamoyloxy-16-p-tolylsulfonyloxymethylestra-1,3,5(10)-triene, a cyclization takes place, in the course of which the N-phenyl-tetrahydrooxazin-2-one derivatives 5–8 are formed. The cis isomers 5, 8 and 8a–e are thermodynamically stable endproducts, while the trans derivatives 6 and 7, formed in a kinetically controlled