Selective synthesis and comparative activity of olefinic isomers of 1,2-benzothiazine-1,1-dioxide carboxylates as aldose reductase inhibitors
作者:Shagufta Parveen、Saghir Hussain、Shaojuan Zhu、Xiangyu Qin、Xin Hao、Shuzhen Zhang、Jianglu Lu、Changjin Zhu
DOI:10.1039/c4ra01016g
日期:——
α,β- and β,γ-unsaturated carboxylate isomers of 1,2-benzothiazine-1,1-dioxide were selectively synthesized via the Wittig olefination reaction under various temperature conditions. At 40 °C, α,β-unsaturated esters with high Z-stereoselectivity (83–87%) were formed, while β,γ-unsaturated esters formed preferentially with moderate to excellent regioselectivity at 100–120 °C (77–96%). The acid isomers
通过Wittig烯化反应在各种温度条件下选择性合成1,2-苯并噻嗪-1,1-二氧化物的α,β-和β,γ-不饱和羧酸酯异构体。在40°C时,会形成具有高Z立体选择性(83–87%)的α,β-不饱和酯,而在100–120°C(77–96%)时,会优先形成具有中等至优异区域选择性的β,γ-不饱和酯。 )。发现酸异构体按活性β,γ-不饱和> Z -α,β-不饱和> E -α,β-不饱和异构体的顺序抑制醛糖还原酶。β,γ-不饱和异构体7b,2- [2-(4-溴-2-氟苄基)-1,1-二氧化物2 H -1,2-苯并噻嗪-4(3 H)-亚烷基]乙酸具有最强的抑制活性,IC 50值为0.057μM。对接研究进一步支持了这一点。