Studies on the syntheses of heterocyclic compounds. Part CCCLXXXV. Pschorr reactions of 1-(2-aminobenzyl)- and 1-(2-aminophenethyl)-1,2,3,4-tetrahydroisoquinolines (total synthesis of thalicsimidine)
作者:T. Kametani、K. Takahashi、T. Sugahara、M. Koizumi、K. Fukumoto
DOI:10.1039/j39710001032
日期:——
7-trimethoxy-(IIIb) and 6-hydroxy-7-methoxy-(IIIc) derivatives were subjected to the Pschorr reaction. Compound (IIIb) afforded thalicsimidine (XIXa); compound (IIIc) gave 3-nitropredicentrine (XIXb) and the (2-hydroxybenzyl)isoquinoline (IIIj), together with the normal product (predicentrine)(XIXc) and the diosphenol-type compound (Ib) in poor yield. However, Pschorr reactions of 1-(2-amino-3,4,5-trimethoxyphenethyl)-(IIId)
为了获得在8a-和2'-位之间偶联的二烯酮,1-(2-氨基-4,5-二甲氧基苄基)-1,2,3,4-四氢-6,8-二甲氧基-2-甲基异喹啉( IIIa)和相应的5,6,7-三甲氧基-(IIIb)和6-羟基-7-甲氧基-(IIIc)衍生物进行Pschorr反应。化合物(IIIb)得到thalicsimidine(XIXa);化合物(IIIc)得到3-硝基predicentrine(XIXb)和(2-羟基苄基)异喹啉(IIIj),以及正常产物(predicentrine)(XIXc)和二酚型化合物(Ib),收率很低。但是,1-(2-氨基-3,4,5-三甲氧基苯乙基)-(IIId)和1-(2-氨基-4-苄氧基-3,5-二甲氧基苯乙基)-1,2,3,4的Pschorr反应-四氢-6,7-二甲氧基-2-甲基异喹啉(IIIn)给出异常产物1',2',3',4'-四氢-5,6,6',7,7'-五甲氧基-2'-甲基螺[indan-1,