A series of novel (2S,3R,4S,5R)-3,4,5-triacetoxy-tetrahydro-2H-pyran-2-yl 1-benzyl-3-phenyl-1H-pyrazole-5-carboxylate derivatives (3) were synthesized by the reaction of 2,3,4-tri-O-acetyl-α-D-xylopyranosyl bromide (2) and 1-benzyl-3-phenyl-1H-pyrazole-5-carboxylic acid (1) in the presence of sodium bicarbonate and tetrabutylammonium bromide in dichloromethane at reflux temperature. The structures
一系列新颖的(2 S,3 R,4 S,5 R)-3,4,5-三乙酰氧基-四氢-2 H-
吡喃-2-基1-苄基-3-苯基-1 H-
吡唑-5 -
羧酸酯衍
生物(3)是通过2,3,4-三-O-乙酰基-α-D-
吡喃
吡喃糖基
溴化物(2)与
1-苄基-3-苯基-1H-吡唑-5-
羧酸的反应合成的在
碳酸氢钠和
溴化四丁
铵存在下,在
二氯甲烷中,在回流温度下,酸(1)。新化合物的结构由IR和1确定根据3d和3g的X射线晶体结构,初步确定了H NMR光谱和HR质谱(HRMS)以及
木糖环中新生成的手性碳(C-1)的构型。