C20 position of methyl pyropheophorbides-a, which is derived from naturally occurring chlorophyll(Chl)-a, were achieved by using N-fluorobenzenesulfonimide (NFSI). All the synthetic Chl-a derivatives possessing a variety of the C3-substituents (vinyl, ethyl, formyl, acetyl, hydroxymethyl, and 1-hydroxyethyl groups) were mono-fluorinated to produce the corresponding 20-fluoro-chlorins as isolated products
在甲基pyropheophorbides-的C20位置位点选择性
氟化反应一,它是从天然存在的叶绿素(叶绿素)衍生的-一个,通过使用实现Ñ -fluorobenzenesulfonimide(
NFSI)。具有各种C3取代基(
乙烯基,乙基,甲酰基,乙酰基,羟甲基和1-羟乙基)的所有合成Chl- a衍
生物均被单
氟化,生成相应的20-
氟-二氢卟
酚分离产物。这些
氟化产物通过1D / 2D NMR,可见光吸收和荧光发射光谱进行表征。由于C20
氟原子的强电负性,其最红的Qy除C3-乙酰基取代基外,吸收和荧光发射带发生了红移。这项研究不仅显示了二氢卟
酚π骨架和C3取代基对
NFSI的耐受性,而且还显示了
氟化Chl文库的潜在可用性。