作者:Alois Fürstner、Denis N. Jumbam
DOI:10.1016/s0040-4020(01)89848-3
日期:1992.1
Highly reactive titanium on graphite as the reagent of choice promotes intramolecular McMurry type reactions of acyloxy- and acylamido carbonyl compounds affording furans, benzofurans and indoles in good to excellent yields. A variety of reducible groups in the substrates is tolerated (e.g. -F, -Cl, -Br, -I, -CF3, -OMe, -CN, -thiophenyl, -COOR, -CONR2) and strained products such as 11h can be obtained
石墨上高反应性的钛作为选择的试剂可以促进分子内的麦克默里型酰氧基和酰基酰胺基羰基化合物的反应,从而以优异的产率提供呋喃,苯并呋喃和吲哚。底物中的多种可还原基团是可耐受的(例如-F,-Cl,-Br,-I,-CF 3,-OMe,-CN,-硫代苯基,-COOR,-CONR 2)和应变产物,例如11h可以获得X射线分析报告。实验结果表明,可能由芳族醛或酮作为反应性中间体形成二价阴离子,它们攻击酯或酰胺的官能团而不是通过酮基的自由基途径。