Oxazolines. 2. 2-Substituted 2-oxazolines as synthons for N-(.beta.-hydroxyethyl)arylalkylamines, intermediates in a synthesis of 1,2,3,4-tetrahydroisoquinolines and 2,3,4,5-tetrahydro-1H-3-benzazepines
Convenient Synthesis of 5-Substituted 2-Amino[1,2,4]triazolo[1,5- a][1,3,5]triazin-7(6H)-ones from N-Triazolide Imidates and 1,2,4-Triazole-3,5-diamine
作者:Detlef Geffken、Mehdi Khankischpur、Finn Hansen
DOI:10.1055/s-0029-1218718
日期:2010.5
A convenient and efficient synthesis of previously unreported N-triazolide imidates and their reaction with 1,2,4-triazole-3,5-diamine to give regioselectively 5-substituted 2-amino[1,2,4]triazolo[1,5-a][1,3,5]triazin-7(6H)-ones is described. The structure of the reported bicyclic compounds has been unambiguously proven by X-ray crystallography.
Synthesis and reactions of 2-amino-7, 8-dimethoxy-1<i>h</i>-3-benzazepines. Competitive formation of 2-amino-1<i>h</i>-3-benzazepines<i>vs</i>. 2-benzylimidazoles
作者:R. L. Robey、C. R. Copley-Merriman、M. A. Phelps
DOI:10.1002/jhet.5570260350
日期:1989.5
A short synthesis of 2-amino-7, 8-dimethoxy-1H-3-benzazepine (1a) from 3, 4-dimethoxyphenylacetonitrile (8a) is reported. The synthesis of several other 2-amino-1H-3-benzazepines 1 is also discussed. Conditions which favor the formation of 1 versus the formation of the isomeric 2-benzylimidazoles 11 are evaluated. Several reactions of 1a are also described.
据报道,由3,4-二甲氧基苯基乙腈(8a)合成了2-氨基-7,8-dimethoxy-1 H -3-苯并ze庚因(1a)。还讨论了其他几种2-氨基-1 H -3-苯并ze庚因1的合成。评价了形成1相对于形成异构的2-苄基咪唑11的条件。还描述了1a的几种反应。
A concise synthesis of (−)-mesembrine
作者:Peter I. Dalko、Virginie Brun、Yves Langlois
DOI:10.1016/s0040-4039(98)02032-2
日期:1998.12
overall yield and with ee>95%. The key step of the sequence is a stereoselectivealkylation reaction of dianion derived from C2 symmetric imidazolines allowing efficient formation of quaternary benzylic center. Chiral auxiliaries derived from (S,S)-1,2-diamino-1,2-diphenylethane 1a and (S,S)-1,2-diaminocyclohexane 1b were compared. This synthesis provided unambiguous correlation of the newly formed
This invention relates to a novel process for preparing 2-amino-8-alkoxybenzazepines. The process involves cyclizing an intermediate alkoxybenzene-ethanimidate with a catalytic amount of one or more acids, optionally in the presence of one or more non-reactive solvents.