Lewis Acid Catalyzed Cyclization of Glycals/2-Deoxy-<scp>d</scp>-ribose with Arylamines: Additional Findings on Product Structure and Reaction Diastereoselectivity
作者:Chengtang Du、Fulong Li、Xuefeng Zhang、Wenxiang Hu、Qizheng Yao、Ao Zhang
DOI:10.1021/jo2015483
日期:2011.11.4
Meanwhile, the diastereoselectivity in InBr3-catalyzed cyclization of glycals with arylamines was also incorrectly reported previously. It was found that high diastereomeric selectivity was achieved only when a C5-substituted glycal was used; otherwise, a pair of diastereomers was obtained in moderate yield with 1:1 diastereomeric ratio. Furthermore, tetrahydrofuran-fused tetrahydroquinolines 5b and
芳基胺与2-脱氧的环化反应d核糖或烯糖在当前报告中重新调查。在蒙脱石KSF-或的InCl 3个2-脱氧-引发的反应d -核糖与芳基胺,一对非对映异构四氢-2的ħ在近1,得到吡喃稠合四氢喹啉:1的比例,其中一种非对映的结构在文献中被错误地分配。同时,InBr 3中的非对映选择性以前也错误地报道了芳基胺催化的糖基环化反应。发现仅当使用C 5-取代的缩醛时才获得高的非对映异构体选择性。否则,以1∶1的非对映体比例以中等收率获得一对非对映体。此外,还通过使用TBDPS保护的核糖作为糖前体和蒙脱土KSF作为活化剂,成功制备了与四氢呋喃融合的四氢喹啉5b和5b'。