A Short and Efficient TotalSynthesis of the Naturally Occurring Coumarins Siderin, Kotanin,Isokotanin A and Desertorin C
作者:Michael Müller、Wolfgang Hüttel、Martin Nieger
DOI:10.1055/s-2003-41027
日期:——
Starting from methyl 2-hydroxy-4-methoxy-6-methylbenzoate (6) and its regioisomeric dehydrodimers 7-9,readily available by an oxidative coupling reaction of 6, the naturally occurring coumarins siderin(1), kotanin (2),isokotanin A (3) and desertorin C (4) were synthesized in a novel and highlyefficient three-step transformation. In the case of kotanin (2) both atropisomers were prepared fromthe pure atropisomers of 7.
从 2-羟基-4-甲氧基-6-甲基苯甲酸甲酯(6)及其通过 6 的氧化偶联反应容易获得的regioisomeric dehydrodimers 7-9 开始,通过新颖高效的三步转化法合成了天然香豆素 siderin(1)、kotanin(2)、isokotanin A (3) 和 desertorin C (4)。在柯坦宁(2)中,两种异构体都是由 7 的纯异构体制备的。