Procyanidin B1, B2, and B3 were synthesized based on a Yb(OTf)3 catalyzed equimolar condensation using methoxy and/or 4-(2”-ethoxyethoxy)drivatives as electrophiles. The anti-inflammatory effect of synthetic procyanidin B1, B2, and B4 on 12-O-tetradecanoylphorbol-13-acetate (TPA)-induced inflammation of mouse ears was examined. Procyanidin B1, B2, B 4 suppressed TPA-induced inflammation of mouse ears by 48%, 34%, and 29%, respectively, at a dose of 200 μg. Their activities are stronger than those of indomethacin and glycyrrhetinic acid, the normally used antiinflammatory agent.
在 Yb(OTf)3 催化下,以甲氧基和/或 4-(2"-乙氧基乙氧基)二元醇为亲电体进行等摩尔缩合,合成了
原花青素 B1、B2 和 B3。研究了合成
原花青素 B1、B2 和 B4 对 12-O- 十四碳酰
樟脑酚-13-
乙酸酯(
TPA)诱导的小鼠耳朵炎症的抗炎作用。在 200 μg 剂量下,
原花青素 B1、B2 和 B4 对
TPA 诱导的小鼠耳朵炎症的抑制率分别为 48%、34% 和 29%。它们的活性强于
吲哚美辛和
甘草次酸(通常使用的抗炎药)。