An efficient preparation of 3-azabicyclo [3.3.0]. Oct-5-en-7-ones from propargyl alcohol- cobalt complexes via nicholas reaction with amidic nitrogen nucleophiles followed by pauson-khand cyclization
摘要:
3-Azabicyclo [3.3.0]-oct-5-en-7-ones were efficiently prepared from cobalt-propagyl alcohol complexes and various allyl amides via Nicholas reaction in the presence of BF3Et2O followed by Pauson-Khand cyclization promoted with trimethylamine N-oxide or SiO2.