(3R,6S,7R,8S,8aR)-7-ethenyl-8-ethyl-3-phenyl-6-prop-2-enyl-2,3,6,7,8,8a-hexahydro-[1,3]oxazolo[3,2-a]pyridin-5-one 在
RuCl2(1,3-dimesityl-imidazolidin-2-yl)(PCy3)(=CHPh) 作用下,
以80%的产率得到(3S,7R,8S,9R,12R)-8-ethyl-12-phenyl-10-oxa-1-azatricyclo[7.3.0.03,7]dodec-5-en-2-one