Preparation and Taste of Certain Glycosides of Flavanones and of Dihydrochalcones
作者:Sachiko Esaki、Kiyotoshi Nishiyama、Naoko Sugiyama、Ryuta Nakajima、Yoshihiro Takao、Shintaro Kamiya
DOI:10.1271/bbb.58.1479
日期:1994.1
The 7-O-[2-O-(α-l-Rhamnopyranosyl)-β-l-quinovoside] of naringenin and of hesperetin, and their dihydrochalcone (DHC) derivatives were synthesized by the method of Koenigs-Knorr (Ag2C03 and quinoline). The reaction of TMS ethers of naringenin and of hesperetin with each of the α-acetofluoro derivatives of d-glucose, l-rhamnose, 2-O-(α-l-rhamnopyranosyl)-l-rhamnose, and 2-O-(α-l-rhamnopy-ranosyl)-d-glucose (neohesperidose), using boron trifluoride etherate as an activator, yielded coupling products which, after deprotection, gave naringenin 4′-O-β-d-glucoside, naringenin 4′-O-α-l-rhamnoside, naringenin 4′-O- [2-O-(α-l-rhamnopyranosyl)-α-l-rhamnoside], hesperetin 3′-O-[2-O-(α-l-rhamnopyranosyl)-α-l-rhamnoside], and naringenin 4′-O-β-neohesperidoside, respectively. Catalytic hydrogenation of these flavanones gave the corresponding DHC derivatives. Hesperetin DHC 4′-O-[2-O-(α-l-rhamnopy-ranosyl-β-l-quinovoside] was 300 times sweeter than sucrose, while the other compounds were bitter or tasteless.
柚皮素和橙皮素及其二氢查耳酮(DHC)衍生物的7-O-[2-O(α-L-鼠李糖吡喃糖基)-β-L-牡荆苷]通过Koenigs-Knorr方法(Ag2CO3和喹啉)合成。柚皮素和橙皮素的TMS醚与D-葡萄糖、L-鼠李糖、2-O-(α-L-鼠李糖吡喃糖基)-L-鼠李糖和2-O-(α-L-鼠李糖吡喃糖基)-D-葡萄糖(新橙皮糖)的α-乙酰氟代衍生物反应,使用三氟化硼乙醚作为活化剂,得到偶联产物,脱保护后分别生成柚皮素4′-O-β-D-葡萄糖苷、柚皮素4′-O-α-L-鼠李糖苷、柚皮素4′-O-[2-O-(α-L-鼠李糖吡喃糖基)-α-L-鼠李糖苷]、橙皮素3′-O-[2-O-(α-L-鼠李糖吡喃糖基)-α-L-鼠李糖苷]和柚皮素4′-O-β-新橙皮糖苷。这些黄烷酮的催化氢化得到相应的DHC衍生物。橙皮素DHC 4′-O-[2-O-(α-L-鼠李糖吡喃糖基)-β-L-牡荆苷]比蔗糖甜300倍,而其他化合物则是苦味或无味。