Efficient and Highly Selective Synthesis of Enantiopure<i>cis</i>- or<i>trans</i>-3,4-Disubstituted 1,2,3,4-Tetrahydroisoquinolines
作者:José M. Concellón、Paula Tuya、Virginia del Solar、Santiago García-Granda、M. Rosario Díaz
DOI:10.1021/ol901388e
日期:2009.8.20
An efficient synthesis of enantiopure 3,4-disubstituted 1,2,3,4-tetrahydroisoquinolines, by treatment of readily available (2R,1′S)- or (2S,1′S)-2-(1-aminoalkyl)epoxides with H3PO4·BF3 complex, under mild reaction conditions, is reported. Both enantiopure diastereoisomers (3S,4S)- and (3S,4R)-3-alkyl-4-hydroxymethyl-1,2,3,4-tetrahydroisoquinolines were available starting from the suitable syn- or anti-aminoepoxide
通过处理容易获得的(2 R,1 'S)-或(2 S,1 'S)-2-(1-氨基烷基)来有效合成对映体纯的3,4-二取代的1,2,3,4-四氢异喹啉报道了在温和的反应条件下与H 3 PO 4 ·BF 3配合物形成的环氧化物。对映纯非对映异构体(3 S,4 S)-和(3 S,4 R)-3-烷基-4-羟甲基-1,2,3,4-四氢异喹啉都可以从合适的顺式或反式起始-氨基环氧化合物。已经提出了基于分子内Friedel-Crafts型反应的机理来解释这些结果。