(1R,2R,4R)-2-exo-Cyano-7-oxabicyclo[2.2.1]hept-5-en-2-yl (1S')-camphanate [(+)-1, Diels-Alder adduct of furan to 1-cyanovinyl (1S)-camphanate] was transformed with high stereoselectivity into (1R,2R,6R,7R)-4-phenyl-3,10-dioxa-5-azatricyclo[5.2.1.0(2,6)]dec-4-en-9- one [(+)-10]. Bromination of the corresponding (tert-butyl)dimethylsilyl enol ether [(-)-11], followed by Baeyer-Villiger oxidation and
(1R,2R,4R)-2-exo-Cyano-7-oxabicyclo [2.2.1] hept-5-en-2-yl(1S')-camphanate [(+)-1,
呋喃的Diels-Alder加合物到1-cyanovinyl(1S)-camphanate]以高立体选择性转化为(1R,2R,6R,7R)-4-苯基-3,10-二氧杂-5-氮杂
三环[5.2.1.0(2,6)] dec -4-en-9-一[(+)-10]。
溴化相应的(叔丁基)二甲基甲
硅烷基烯醇醚[(-)-11],然后进行Baeyer-Villiger氧化,然后碱式
甲醇分解,得到甲基3-
氨基-1,5-脱
水-2-O,3-N-苯甲酰基-3-脱氧-α-L-
呋喃呋喃酸酯[(-)-17],将其还原得到3-
氨基-1,5-脱
水-2--2-O,3-N-苯甲酰基-3-脱氧-α- L-talofuranose [(-)-19]。用HCl
水溶液处理,得到