Improved preparation and synthetic uses of 3-deoxy-d-arabino-hexonolactone: an efficient synthesis of Leptosphaerin
作者:Christian Pedersen
DOI:10.1016/s0008-6215(99)00007-5
日期:1999.1
Abstract Acetylation of d -glucono-1,5-lactone and subsequent treatment with triethylamine gave 2,4,6-tri-O-acetyl- d -erythro-hex-2-enono-1,5-lactone. Hydrogenation of the latter in the presence of palladium on carbon yielded 2,4,6-tri-O-acetyl-3-deoxy- d -arabino-hexono-1,5-lactone (5) in almost quantitative yield calculated from gluconolactone. Catalytic hydrogenation of 5 with platinum on carbon
摘要d-葡萄糖基-1,5-内酯乙酰化并随后用三乙胺处理,得到2,4,6-三-O-乙酰基-d-赤型-己基-2-enono-1,5-内酯。在钯/碳存在下,后者的氢化反应产生了由葡糖酸内酯计算出的几乎定量的产率的2,4,6-三-O-乙酰基-3-脱氧-d-阿拉伯糖基己基-1,5-内酯(5)。在三乙胺的存在下,用铂在碳上催化氢化5,得到定量的2,4,6-三-O-乙酰基-3-脱氧-d-阿拉伯糖基己糖。5的脱乙酰基产生3-deoxy-d-阿拉伯-己基-1,4-内酯,将其转化为3-deoxy-5,6-6-O-异亚丙基-2-O-甲磺酰基-d-arabino-hexono-1, 4-内酯(10)。后者被转化为2-乙酰氨基-2,3-二脱氧-d-赤-己基-2-enono-1,4-内酯(Leptosphaerin)。当10在酸的存在下在水中煮沸时,