Dibenzo-fused seven-membered nitrogen heterocycles by a tandem reduction-lactamization reaction
作者:Richard A. Bunce、James E. Schammerhorn
DOI:10.1002/jhet.5570430432
日期:2006.7
Efficient syntheses of dibenz[b,f][1,4]oxazepin-11(10H)-one, 5,10-dihydro-11H-dibenzo[b,e][1,4]-diazepin-11-one and 5,11-dihydro-6H-dibenz[b,e]azepin-6-one are described using a tandem reductionlactamization sequence. Precursors for these ring systems are available in 1-3 steps using nucleophilic aromatic substitution and Ullmann coupling methodology. Direct reduction-lactamization of these compounds
dibenz [ b,f ] [1,4] oxazepin-11(10 H)-one,5,10-dihydro-11 H -dibenzo [ b,e ] [1,4] -diazepin-11-one的高效合成使用串联还原内酰胺化序列描述了和5,11-二氢-6 H-二苯并[ b,e ] azepin -6-one。使用亲核芳香族取代和Ullmann偶联方法,可在1-3个步骤中获得这些环系统的前体。使用铁粉在115°C的乙酸中将这些化合物直接还原内酰胺化,可提供≥90%收率的目标杂环。