Transformation of (+)-thiomicamine into chiral non-racemic 3,4-dihydroisoquinolinium salts: application for catalytic asymmetric epoxidation of alkenes and oxidation of sulfides
作者:Agata Głuszyńska、Iwona Maćkowska、Maria D. Rozwadowska、Wiesława Sienniak
DOI:10.1016/j.tetasy.2004.06.043
日期:2004.8
(1S,2S)-(+)-Thiomicamine 7 (R=SCH3) has been transformed into (3S,4R)-2,3-dimethyl-4-phenyl-3,4-dihydroisoquinolinium tetrafluoroborate 2 in a five-step reaction sequence involving (3S,4R)-2,3-dimethyl-1,2,3,4-tetrahydroisoquinolinie 14 as the key intermediate. Iminium salt 16 has been evaluated as a promoter of catalytic asymmetric epoxidation of trans-stilbene and oxidation of methyl-p-tolyl sulfide, affording products in satisfactory yield and with enantioselectivities up to 45% and 42%, ee, respectively. (C) 2004 Elsevier Ltd. All rights reserved.
(1S,2S)-(+)-Thiomicamine 7 (R=SCH3) 已经通过一个五步反应序列转化为 (3S,4R)-2,3-二甲基-4-苯基-3,4-二氢异喹啉阳离子四氟硼酸盐 2,其中 (3S,4R)-2,3-二甲基-1,2,3,4-四氢异喹啉 14 是关键中间体。Iminium 盐 16 已被评估为 trans-取代苯乙烯催化不对称环氧化和甲基-p-甲苯基硫醚氧化的促进剂,提供了满意产量和分别高达 45% 和 42%ee 的对映选择性。② 2004 Elsevier Ltd. 保留所有权利。