反应详情

The treatment of Compound 5D with an acid such as hydrochloric acid under cooling conditions provides (allyl-5,6-dichloro-pyridin-3-yl)-amino)-acetaldehyde which when treated with 2-(S)-hydroxyamino-2-phenyl-ethanol and magnesium bromide in a solvent such as isopropyl alcohol provides (3S,4S)-2-[5-(5,6-dichloro-pyridin-3-yl)-hexahydro-pyrrolo[3,4-c]isoxazol-1-yl]-2-(2′S)-phenyl-ethanol (Compound 5G). Compound 5G when treated with methanesulfonyl chloride to generate the mesylate which is then treated with sodium tert-butoxide followed by an acidic workup provides (3S,4S)-5-(5,6-dichloro-pyridin-3-yl)-hexahydro-pyrrolo[3,4-c]isoxazole (Compound 5H). The treatment of Compound 5H with Raney-nickel and 40 PSI of hydrogen in a mixture of tetrahydrofuran, ethanol and water provides (3S,4S)-[4-amino-1-(5,6-dichloro-pyridin-3-yl)-pyrrolidin-3-yl]-methanol (Compound 51). The treatment of Compound 51 with thionyl chloride and N-methylpyrrolidinone under heated conditions in 1,2-dimethoxyethane followed by treatment with sodium hydroxide or another similar base provides (1S,5S)-3-(5,6-dichloropyridin-3-yl)-3,6-diaza-bicyclo[3.2.0]heptane (Compound 5J).