Cinchona Alkaloid Thiourea Catalyzed Asymmetric Synthesis and Anticancer Activity Evaluation of Tetrahydro-β-spirooxindoles
作者:Weihui Zhong、Liang Qi、Huacui Hou、Fei Ling、Lu Fang、Wenjun Luo
DOI:10.3987/com-18-13907
日期:——
Asymmetric synthesis and activity evaluation of tetrahydro-beta-spirooxindole compounds is reported in this paper. Cinchona alkaloid thiourea has been utilized as catalyst for the asymmetric synthesis of tetrahydro-beta-spirooxindoles, affording the desired products in moderate to good yields and with up to 94:6 er. Interestingly, the spirooxindoles exhibited moderate to good in vitro antitumor activity for A549 cells. Besides, the growth inhibitory activities of these selected compounds against normal lung cell CHL cells were further evaluated.
Highly Enantioselective Pictet-Spengler Reaction Catalyzed by SPINOL-Phosphoric Acids
作者:Dan Huang、Fangxi Xu、Xufeng Lin、Yanguang Wang
DOI:10.1002/chem.201103207
日期:2012.3.12
enantioselective catalysts for the asymmetric Pictet–Spengler reaction of Nb‐α‐naphthylmethyl tryptamines with a series of aliphatic and aromatic aldehydes, affording opticallyactive tetrahydro‐β‐carbolines in excellent yields and ee values. The current protocol has been applied in the asymmetric total synthesis of (−)‐harmicine.
手性SPINOL-磷酸是N b -α-萘甲基甲基色胺与一系列脂族和芳族醛的不对称Pictet-Spengler反应的高度对映选择性催化剂,可提供具有优异收率和ee值的旋光四氢-β-咔啉。当前协议已应用于(-)-甜菜碱的不对称总合成中。
Copper/Iodine Co-catalyzed Oxygenative Transannulation of Tryptamines Enables Direct Synthesis of Donaxaridine and Its Derivatives
transannulation strategy using readily available tryptamines. Molecular oxygen and water are used as oxygen sources and provide direct access to the donaxaridine scaffold and its derivatives. This methodology is applied to the efficient synthesis of the natural products donaxaridine, chimonamidine, donaxanine, donaxarine, and aline in just one or two steps. The tryptamines, albeit with oxy-sensitive dialkyl N-H