Isoquinoline formation via iminium ions cyclization: A direct approach to c-2′ functionalized 3-aryltetrahydroisoquinolines
作者:Nuria Sotomayor、Esther Domínguez、Esther Lete
DOI:10.1016/0040-4020(95)00770-9
日期:1995.10
3-Aryltetrahydroisoquinoline derivatives can be efficiently prepared by titanium tetrachloride promoted cyclization of N-methoxymethyl-N-1,2-diarylethylamines via iminium ions. In the case of primary amines, the 1-aryl group prevents the alkylation of a second iminium ion, avoiding dimerization. The mild reaction conditions are compatible with the presence of acid sensitive groups; thus, the 2′-functionalized
3-芳基四氢异喹啉衍生物可通过四氯化钛通过亚胺离子促进N-甲氧基甲基-N -1,2-二芳基乙胺的环化反应而有效地制备。在伯胺的情况下,1-芳基防止第二亚胺离子的烷基化,避免二聚。温和的反应条件与酸敏感基团的存在相适应。因此,可以高产率地制备2'-官能化的3-芳基四氢异喹啉6a而无需甲硅烷基化。因此,这是质子酸催化的Pictet-Spengler方法的一个很好的选择,当将其应用于2'-官能化胺时,甲硅烷基化的3-芳基四氢异喹啉4的收率低3a。