申请人:Franzen Manuela
公开号:US20120157671A1
公开(公告)日:2012-06-21
Enantiomerically enriched (1S,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-β-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.
通过对环戊二烯进行杂环Diels-Alder环加成反应,使用配方中PG1为氨基保护基团的保护1-C-亚硝基-β-D-核糖呋喃糖卤化物,制备富集对映体(1S,4R)-2-氧杂-3-氮杂双环[2.2.1]庚-5-烯,其中X为从氟、氯、溴和碘中选择的卤素原子,PG2为羟基保护基团,PG3为1,2-二醇保护基团。