作者:Kálmán Hideg、Tamás Kálai、József Jekő
DOI:10.1055/s-0029-1217402
日期:2009.8
The Suzuki reaction of the pyrroline nitroxide, 3-bromo-4-formyl-2,2,5,5-tetramethyl-2,5-dihydro-1H-pyrrol-1-yloxyl radical, with vinylboronic acids and subsequent Horner-Wadsworth-Emmons reaction followed by electocyclic reaction of the thus formed 1,3,5-triene and oxidation offers a new route for the synthesis of 5,6-disubstituted 1,1,3,3-tetramethylisoindolin-2-yloxyl radicals. The alternative Diels-Alder
硝基吡咯啉,3-溴-4-甲酰基-2,2,5,5-四甲基-2,5-二氢-1 H-吡咯-1-基氧基与乙烯基硼酸和随后的Horner-Wadsworth的Suzuki反应-形成的1,3,5-三烯的电子反应随后进行环化反应和氧化为5,6-二取代的1,1,3,3-四甲基异吲哚啉-2-基氧基的合成提供了一条新途径。替代的Diels-Alder反应路径有时会导致收率低下。从5-(乙氧羰基)-1,1,3,3-四甲基-6-苯基异吲哚-2-基氧基开始,我们得到了自旋标记的芴酮。 交叉偶联-Diels-Alder反应-电环反应-自由基-Wittig反应