Chiral aziridine-2-carboxylates: versatile precursors for functionalized tetrahydroisoquinoline (THIQ) containing heterocycles
作者:Kyu Myung Lee、Jong Chan Kim、Philjun Kang、Won Koo Lee、Heesung Eum、Hyun-Joon Ha
DOI:10.1016/j.tet.2011.11.031
日期:2012.1
2-carboxamide 4 is an effective route for the synthesis of 3-(hydroxymethyl)-1,2,3,4-tetrahydroisoquinolin-4-ols. Stereoselective reduction of the cyclic imines 17a–j resulted in (1S,3S,4R)-4-(tert-butyldimethylsilyl-oxy)-3-[(tert-butyldimethylsilyloxy)methyl]-6,7-dimethoxy-1,2-disubstituted-1,2,3,4-tetrahydroisoquinolines and the desilylation of the TBS groups afforded (1S,3S,4R)-3-(hydroxymethyl)-6
由(S)-N-甲氧基-N-甲基-1-[(R)-1-苯基乙基]氮丙啶-2-羧酰胺4制备官能化的3,4-二氢异喹啉17a – j是合成3的有效途径-(羟甲基)-1,2,3,4-四氢异喹啉-4-醇。立体选择性还原环状亚胺17a – j产生(1 S,3 S,4 R)-4-(叔丁基二甲基甲硅烷基-氧基)-3-[(叔-丁基二甲基甲硅烷氧基)甲基] -6,7-二甲氧基-1,2-二取代-1,2,3,4-四氢异喹啉和TBS基团的甲硅烷基化反应提供(1 S,3 S,4 R)-3-(羟甲基)-6,7-二甲氧基-1,2-二取代-1,2,3,4-四氢异喹啉-4-醇19a – i的收率很高。同样,通过钯催化的N-芳基化和CC偶联反应成功地实现了新型四环3-(羟甲基)-1,2,3,4-四氢异喹啉-4-醇23和25的不对称合成。