Treatment of easily obtainable 1-alkylamino-1,3,6-trideoxyhexitols with hydrogen fluoride in the presence of formic acid gives the corresponding C-5 inverted 2,5-anhydrides in high yields. The synthesis of allo-muscarine and its N-benzyl analog from galactono-1,4-lactone is reported in 30 and 41% overall yield, respectively.
在
甲酸存在的情况下,用
氟化氢处理易得的1-烷基
氨基-1,3,6-三脱氧己糖醇,可获得相应的C-5倒置2,5-酸酐,且收率很高。据报道,从半
乳糖酸-1,4-内酯合成异-毒蕈碱及其N-苄基类似物的总收率分别为30%和41%。