5-(Diethoxyphosphorylmethyl)-5-methyl-4,5-dihydro-3H-pyrrole N-oxide: synthesis and evaluation of spin trapping properties
作者:Valérie Roubaud、Anne Mercier、Gilles Olive、François Le Moigne、Paul Tordo
DOI:10.1039/a608510e
日期:——
A new spin trap, the
5-(diethoxyphosphorylmethyl)-5-methyl-4,5-dihydro-3H-pyrrole
N-oxide (3), is prepared through a four-step synthetic route.
The in vitro spin trapping properties of 3 have been
investigated and the hydroxyl and superoxide spin adducts characterised.
The persistence of the superoxide spin adduct obtained with 3 is
compared with those of the analogues obtained with DEPMPO
[5-(diethoxyphosphoryl)-5-methyl-4,5-dihydro-3H-pyrrole
N-oxide] and DMPO in both phosphate buffer and pyridine. In 0.1
M phosphate buffer at pH 7.0, the HOO-3˙
adduct is found to be 2.8 times more persistent than
HOO-DMPO˙, but 5.7 times less than
HOO-DEPMPO˙. In phosphate buffer,
HOO-3˙ decomposes to give HO-3˙. The
stereoselectivity of the addition of free radicals on 3 is generally
poor, and mixtures of diastereomers have been observed by EPR. The
overall spin trapping behaviour of nitrone 3 is more similar to that of
DMPO than that of DEPMPO.
一种新的自旋陷阱
5-(二乙氧基磷酰甲基)-5-甲基-4,5-二氢-3H-吡咯
N-氧化物(3)是通过四步合成路线制备的。
3 的体外自旋捕获特性
研究并表征了羟基和超氧化物自旋加合物。
用3得到的超氧化物自旋加合物的持久性是
与用 DEPMPO 获得的类似物相比
[5-(二乙氧基磷酰基)-5-甲基-4,5-二氢-3H-吡咯
N-氧化物]和DMPO在磷酸盐缓冲液和吡啶中。 0.1以内
M 磷酸盐缓冲液,pH 7.0,HOO-3˙
发现加合物的持久性是其 2.8 倍
HOO-DMPO˙,但比其低 5.7 倍
HOO-DEPMPO˙。在磷酸盐缓冲液中,
HOO-3˙分解得到HO-3˙。这
3上自由基加成的立体选择性通常为
差,并且通过 EPR 观察到非对映异构体的混合物。这
硝酮 3 的整体自旋捕获行为与
DMPO 优于 DEPMPO。