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Method for producing (1S, 4R) -2-oxa-3-azabicyclo 2.2.1 hept-5-ene
Method for producing (1S, 4R) -2-oxa-3-azabicyclo 2.2.1 hept-5-ene
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机译:(1S,4R)-2-oxa-3-azabicyclo [2.2.1]庚-5-烯的生产方法
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摘要
Enantiomerically enriched (1 S,4R)-2-oxa-3-azabicyclo[2.2.1]hept-5-ene of formula wherein PG1 is an amino-protective group, are prepared from cyclopentadiene via hetero-Diels-Alder cycloaddition with protected 1-C-nitroso--D-ribofuranosyl halides of formula wherein X is a halogen atom selected from fluorine, chlorine, bromine and iodine, PG2 is a hydroxyl-protective group and PG3 is a 1,2-diol-protective group.
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