A New Method for Synthesis of Crown Ether Type Pyridinophanes
摘要:
Bis(acylketene) (3) thermally generated from Meldrum's acid derivative (2) underwent intramolecular [4+2] cycloaddition to produce bridged dehydroacetic acid derivative (4). Heating 4 with methylamine and ammonia afforded crown ether type pyridinophanes (5) and (6) (12-crown-4), respectively. Reaction of the ketene (3) with (ethylene glycol)s afforded macrolactones (11similar to13) in satisfactory yields. Molecular structures of 4 and 6 are discussed based on X-Ray crystallographic analysis.
A New Method for Synthesis of Crown Ether Type Pyridinophanes
摘要:
Bis(acylketene) (3) thermally generated from Meldrum's acid derivative (2) underwent intramolecular [4+2] cycloaddition to produce bridged dehydroacetic acid derivative (4). Heating 4 with methylamine and ammonia afforded crown ether type pyridinophanes (5) and (6) (12-crown-4), respectively. Reaction of the ketene (3) with (ethylene glycol)s afforded macrolactones (11similar to13) in satisfactory yields. Molecular structures of 4 and 6 are discussed based on X-Ray crystallographic analysis.
Bis(acylketene) (3) thermally generated from Meldrum's acid derivative (2) underwent intramolecular [4+2] cycloaddition to produce bridged dehydroacetic acid derivative (4). Heating 4 with methylamine and ammonia afforded crown ether type pyridinophanes (5) and (6) (12-crown-4), respectively. Reaction of the ketene (3) with (ethylene glycol)s afforded macrolactones (11similar to13) in satisfactory yields. Molecular structures of 4 and 6 are discussed based on X-Ray crystallographic analysis.