Synthesis and evaluation in asymmetric hydrogenation of carbohydrate-derived 1,3-bisphosphines
作者:Chunbao Li、Bruno Bernet、Andrea Vasella、Emil A. Broger、Arthur Meili
DOI:10.1016/0008-6215(92)84158-o
日期:1992.9
corresponding phosphine oxide 14 . Similarly, 1 was transformed into 1,6-anhydro-2,4-dideoxy-2-(diphenylphosphino)-4-phenylthio-β- d -glucopyranose ( 16 ) and its oxide 17 . Attempted ring opening of 1 by Ph 2 PH/KOH or by Ph 2 PH/AlMe 3 and oxidative work-up gave 1,6-anhydro-3,4-dideoxy-4-(diphenylphosphoryl)-β- d - threo -hex-3-enopyranose ( 3 ). In the presence of HCl, both 3 and 7 (obtained by air oxidation
摘要考虑到它们在过渡金属催化的不对称氢化反应中作为双齿配体的应用,已经从1,6-脱水-β-d-吡喃葡萄糖制备了1,3-双膦和1,3-膦硫化物。在AlMe 3存在下1,6:3,4-双脱水-2-O-(对甲苯磺酰基)-β-d-吡喃半乳糖(1)与Ph 2 PH反应得到1,6:2,3-双脱水-4-脱氧-4-(二苯基膦基)-β-d-甘露吡喃糖(6),经LiPPh 2处理后,生成1,6-脱水-2,4-二脱氧-2,4-双(二苯基膦基)- β-d-吡喃葡萄糖(9)。用1-萘甲酰氯将9酯化,得到萘甲酸酯11。暴露于空气中时,9和11被氧化为相应的双膦二氧化物10和12。用PhSH和DBU处理6会导致1,6-脱水-2,4-二脱氧-4-(二苯基膦基)-2-苯硫基-β-d-吡喃葡萄糖(13)和,用空气氧化后,生成相应的氧化膦14。同样,将1转化为1,6-脱水-2,4-二脱氧-2-(二苯基膦基)-4-苯硫基-β-d-