Synthesis of 4<i>H</i>
-Benzo[<i>e</i>
][<i>1,3</i>
]oxazin-4-ones by a Carbonylation-Cyclization Domino Reaction of <i>ortho</i>
-Halophenols and Cyanamide
作者:Linda Åkerbladh、Shiao Y. Chow、Luke R. Odell、Mats Larhed
DOI:10.1002/open.201700130
日期:2017.10
preparation of 4H‐1,3‐benzoxazin‐4‐ones by a domino carbonylation–cyclization process is developed. Readily available ortho‐iodophenols are subjected to palladium‐catalyzed carbonylative coupling with Mo(CO)6 and cyanamide, followed by a spontaneous, intramolecular cyclization to afford 4H‐1,3‐benzoxazin‐4‐ones in moderate to excellent yields. Furthermore, the scope of the reaction is extended to include
通过多米诺羰基化-环化过程,开发了一种温和方便的一步制备4 H -1,3-苯并恶嗪-4-酮的方法。现成的邻碘代苯酚与Mo(CO)6和氰胺进行钯催化的羰基偶合,然后自发地进行分子内环化,以中等至优异的产率得到4 H -1,3-苯并恶嗪-4-酮。此外,反应范围扩大到包括挑战性的邻溴酚。最后,为了强调所开发方法的多功能性,Mo(CO)6已成功地被广泛的CO释放试剂所取代,例如草酰氯,甲酸苯酯,9-甲基芴-9-羰基氯和甲酸,这使其成为合成4 H-苯并[ e ]的有吸引力的策略[ 1,3 ]恶嗪-4-酮。