两个非对映异构三萜皂甙的结构鉴定

Structural Identification of Two Diastereoisomeric Saponins from Albizia Julibrissin

从合欢皮 95%乙醇提取物中分得 2个新三糖链九糖皂甙 (1,2 ) ,经化学方法和光谱分析 ,将其结构分别鉴定为 :3- O- [β- D-吡喃木糖基 - (1→ 2 ) - β- D-吡喃阿拉伯糖基 - (1→ 6 ) - β- D-葡萄糖基 ]- 2 1- O- { (6 S) - 2 -反式 - 2 ,6 -二甲基 - 6 - O- [4 - O- ((6 R) - 2 -反式 - 2 ,6 -二甲基 - 6 - O- β- D-吡喃鸡纳糖基- 2 ,7-辛二烯酸基 ) -β- D-吡喃鸡纳糖基 ]- 2 ,7-辛二烯酸基 }金合欢酸 2 8- O-β- D-吡喃葡萄糖基 - (1→3) - [α- L-呋喃阿拉伯糖基 - (1→ 4 ) ]- α- L-吡喃鼠李糖基 - (1→ 2 ) - β- D-吡喃葡萄糖基酯 (1)和 3- O- [β-D-吡喃阿拉伯糖基 - (1→ 2 ) - β- D-吡喃呋糖基 - (1→ 6 ) - β- D-葡萄糖基 ]- 2 1- O- { (6 S) - 2 -反式 - 2 ,6 -二甲基 - 6 - O- [4 - O- ((6 S) - 2 -反式 - 2 ,6 -二甲基 - 6 - O- β- D-吡喃鸡纳糖基 - 2 ,7-辛二烯酸基 ) - β- D-吡喃鸡纳糖基 ]- 2 ,7-辛二烯酸基 }金合欢酸 2 8- O-β- D-吡喃葡萄糖基 - (1→ 3) - [α- L -呋喃阿拉伯糖基 - (1→4 ) ]- α- L-吡喃鼠李糖基 - (1→ 2 ) - β- D-吡喃葡萄糖基酯 (2 ) ,分别命名为合欢皂甙 J14 (JulibrosideJ14 )和合欢皂甙 J15(Julibroside J15)

Two new diastereoisomeric saponins named as Julibroside J 14 and Julibroside J 15 were isolated from the dried stem barks of Albizia julibrissin. On the basis of chemical and spectral methods, their structures were elucidated as 3 O [ β D xylopyranosyl (1→2) β D arabinonosyl (1→6) β D glucopyranosyl] 21 O ｛ (6S) 2 trans 2,6 dimethyl 6 O [4 O ( (6R) 2 trans 2,6 dimethyl 6 O β D quinovopyranosyl 2,7 octadienoyl) β D quinovopyranosyl] 2,7 octadienoyl｝ acacic acid 28 O β D glucopyranosyl (1→3) [α L arabinofuranosyl (1→4)] α L rhamnopyranosyl (1→2) β D glucopyranosyl ester (1) and 3 O [β D xylopyranosyl (1→2) β D arabinopyranosyl (1→6) β D glucopyranosyl] 21 O ｛ (6S) 2 trans 2,6 dimethyl 6 O [4 O ( (6S) 2 trans 2,6 dimethyl 6 O β D quinovopyranosyl 2,7 octadienoyl) β D quinovopyranosyl] 2,7 octadienoyl｝ acacic acid 28 O β D glucopyranosyl (1→3) [ α L arabinofuranosyl (1→4)] α L rhamnopyranosyl (1→2) β D glucopyranosyl ester(2), respectively. [WT5HZ]