Diastereomeric Reissert Compounds of Isoquinoline and 6,7-Dimethoxy-3,4-dihydroisoquinoline in Stereoselective Synthesis
作者:Harry W. Gibson、Michael A. G. Berg、Jennifer Clifton Dickson、Pierre R. Lecavalier、Hong Wang、Joseph S. Merola
DOI:10.1021/jo070786k
日期:2007.7.1
tert-butyl carbinyl l-menthyl carbonate ((S)-12), which was obtained in pure form by a single recrystallization; hydrolysis produced 99% pure S-(−)-1-isoquinolyl tert-butyl carbinol [(S)-16]. Reactions of the anions of diastereomeric Reissert compounds, either as mixtures or pure single species, with aromatic aldehydes and alkyl halides proceeded with at best modest selectivity (diastereomeric ratios up to
手性酸的氯化物,用异喹啉和6,7-二甲氧基-3,4-二氢异喹啉反应以形成非对映体化合物Reissert 8 - 11和18 - 21分别。在形成9-苯基薄荷基衍生物20时获得了最佳的非对映选择性(80:20)。2-非对映体升-menthoxycarbonyl -1,2- dihydroisoquinaldonitriles(小号)- 8 /([R )- 8),形成于等量,是不可分离的。然而,2- cholesteryloxycarbonyl -1,2- dihydroisoquinaldonitriles((各非对映- [R )- 11和(小号)- 11)和2-升-menthoxycarbonyl -6,7-二甲氧基-1,2,3,4- tetrahydroisoquinaldonitriles((小号)- 19 /(- [R )- 19))分别容易地纯化。(小号)- 8 /([R )- 8