New multicomponent domino reactions (MDRs) in water: highly chemo-, regio- and stereoselective synthesis of spiro{[1,3]dioxanopyridine}-4,6-diones and pyrazolo[3,4-b]pyridines
作者:Ning Ma、Bo Jiang、Ge Zhang、Shu-Jiang Tu、Walter Wever、Guigen Li
DOI:10.1039/c0gc00073f
日期:——
multicomponent domino reactions (MDRs) have been established for the synthesis of spiropyrazolo[1,3]dioxanopyridine}-4,6-diones, spiroisoxazolo[1,3]dioxanopyridine}-4,6-diones and pyrazolo[3,4-b]pyridines. The MDRs were conducted by reacting readily available and inexpensive starting materials in aqueous solution under microwave irradiation. A total of 26 examples were examined, and showed a broad substrate
已经建立了新的多组分多米诺反应(MDR),用于合成螺吡唑并[1,3]二恶氧吡啶} -4,6-二酮,螺异唑并[1,3]二氧杂吡啶} -4,6-二酮和吡唑并[ 3,4- b ]吡啶。通过在微波辐射下使易得且廉价的起始原料在水溶液中反应来进行MDR。总共检查了26个实例,它们显示出较宽的底物范围和较高的总收率(76-93%)。已经提出了一种新的机理来解释反应过程以及由此产生的化学,区域和立体选择性。本绿色合成方法显示出有吸引力的特性,例如使用水 作为反应介质,一锅条件,反应时间短(9-13分钟),后处理容易/纯化 且无需使用任何酸或金属助催化剂即可减少废物产生。