The chemical structure and absolute stereochemistry of three new α-pyrones, synparvolides A-C, isolated from Syncolostemon parviflorus, have been established respectively as 6R-[5S,6S-(diacetyloxy)-1R,2S-(epoxy)-3S-(hydroxy)-heptyl]-5,6-dihydro-2H-pyran-2-one, 6R-[1Z,5S,6S-(diacetyloxy)-3S-(hydroxy)-1-heptenyl]-5,6-dihydro-2H-pyran-2-one and 6R-[6S-(acetoxy)-1R,3S-(dihydroxy)-2R,5R-(epoxy)-heptyl]-5
从 Syncolostemon parviflorus 中分离出的三种新的
α-吡喃酮,synparvolides AC 的
化学结构和绝对立体
化学分别确定为 6R-[5S,6S-(diacetyloxy)-1R,2S-(epoxy)-3S-(hydroxy) -庚基]-5,6-二氢-
2H-吡喃-2-酮,6R-[1Z,5S,6S-(
二乙酰氧基)-3S-(羟基)-
1-庚烯基]-5,6-二氢-2H- pyran-2-one 和 6R-[6S-(acetoxy)-1R,3S-(dihydroxy)-2R,5R-(epoxy)-heptyl]-5,6-dihydro-2H-pyran-2-one,基于光谱、手性和
化学证据。