作者:Hideji Osuga、Hitomi Suzuki、Kazuhiko Tanaka
DOI:10.1246/bcsj.70.891
日期:1997.4
2-f]quinolines containing π-excessive thiophene and π-deficient pyridine units were prepared by the use of exo-3-amino-2-hydroxybornane as a chiral auxiliary. This procedure consists of separation of the helical diastereomers prepared by photocyclization of 1,2-diarylethylenes and removal of the chiral auxiliary by a thiolate ion. Large scale preparation of the helicenes can be accomplished by a modified
光学活性 2-(羟甲基)- 和 2-(乙基硫代羰基)[1] 苯并噻吩并 [5',4' : 2,3][1] 苯并噻吩 [4',5 : 4,5] 噻吩并 [3,2-f ]喹啉含有 π-过量噻吩和 π-缺陷吡啶单元是通过使用外型-3-氨基-2-羟基冰片烷作为手性助剂制备的。该过程包括分离通过 1,2-二芳基乙烯的光环化制备的螺旋非对映异构体和通过硫醇盐离子去除手性助剂。螺旋烯的大规模制备可以通过改进的光环化反应程序来完成。2-(羟甲基)-和2-(乙硫羰基)[1]苯并噻吩并[5',4': 2,3][1]苯并噻吩并[4',5': 4,5]噻吩并[1]对映异构体的光学纯度3,2-f]喹啉>99.5%。它们的绝对构型是通过比较 CD 光谱确定的。