作者:Michaela Bleile、Trixie Wagner、Hans-Hartwig Otto
DOI:10.1002/hlca.200590231
日期:2005.11
eliminated during the reaction (Schemes 2 and 3), whereas a substitution at C(5a) was observed when an electron-withdrawing group, Tos (4-MeC6H4SO2) or pivaloyl (Me3CCO), was not eliminated (Scheme 1). Complex results were found in reactions between 1-(trimethylsilyl)-3-1-[(trimethylsilyl)oxy]ethenyl}-1H-indole, in contrast to formerly reported results (Scheme 3). Some derivatives of 1H,5H-[1,2,4]triazolo[1′
N-保护的3- 1-[(三甲基甲硅烷基)氧基]乙烯基} -1 H-吲哚与取代的马来酰亚胺(= 1 H-吡咯-2,5-二酮)之间的环加成反应生成取代的吡咯并[3,4- a ]咔唑衍生物在C(5a)或C(10b)处带有一个额外的琥珀酰亚胺(=吡咯烷-2,5-二酮)部分,具体取决于吲哚N原子上保护基的类型。当在反应过程中消除保护基Me 3 Si或Boc(t BuOCO)时,分离出在C(10b)处取代的衍生物(方案2和3),而当电子被保护时,在C(5a)处观察到取代基抽出组,Tos(4-MeC 6 H 4没有消除SO 2或新戊酰基(Me 3 CCO)(流程1)。与以前报道的结果相反,在1-(三甲基甲硅烷基)-3- 1-[([三甲基甲硅烷基)氧基]乙烯基} -1 H-吲哚之间的反应中发现了复杂的结果(方案3)。从反应中获得了1 H,5 H- [1,2,4] triazolo [1',2:1,2]哒嗪并[3