One-pot synthesis of 2,4-disubstituted quinolines via silver-catalyzed three-component cascade annulation of amines, alkyne esters and terminal alkynes
作者:Yunlan Li、Qiurui Zhang、Xuefeng Xu、Xu Zhang、Yurong Yang、Wei Yi
DOI:10.1016/j.tetlet.2019.03.003
日期:2019.4
Described herein is a new and general method for one-pot synthesis of 2,4-disubstituted quinolines via silver-catalyzed [3 + 1 + 2] annulation of simple amines, alkyne esters and terminal alkynes. The versatile transformation might initiate with the facile formation of the enamine species with the feature of good to excellent yields, exclusive regioselectivity, and excellent substrate/functional group
B(C 6 F 5 ) 3 -catalyzed metal-free hydrogenations of 2-quinolinecarboxylates
作者:Caifang Han、E. Zhang、Xiangqing Feng、Shoufeng Wang、Haifeng Du
DOI:10.1016/j.tetlet.2018.02.057
日期:2018.4
A metal-free hydrogenation of 2-quinolinecarboxylates has been realized by using 5 mol% of B(C6F5)3 as catalyst. A variety of tetrahydroquinolines were obtained in 57–99% yields. An attempt for the asymmetric hydrogenation with chiral boron Lewis acids generated from chiral dienes afforded very low ee’s.
通过使用5mol%的B(C 6 F 5)3作为催化剂,已经实现了2-喹啉羧酸酯的无金属氢化。以57–99%的收率获得了各种四氢喹啉。尝试用手性二烯生成的手性硼不对称氢化路易斯酸可提供非常低的ee。
Enantioselective Synthesis of 2-Functionalized Tetrahydroquinolines through Biomimetic Reduction
Biomimetic asymmetric reduction of 2-functionalized quinolines has been successfully developed with the chiral and regenerable NAD(P)H model CYNAM in the presence of transfer catalyst simple achiral phosphoric acids, providing the chiral 2-functionalized tetrahydroquinolines with up to 99% ee. Using this methodology as a key step, a chiral and potent opioid analgesic containing a 1,2,3,4-tetrahydroquinoline
Discovery and efficient synthesis of a biologically active alkaloid inspired by thiostrepton biosynthesis
作者:Qingfei Zheng、Shoufeng Wang、Wen Liu
DOI:10.1016/j.tet.2014.06.076
日期:2014.10
numerous biological activities, including anti-bacterial, anti-tumor, and anti-plasmodial activities. The quinaldic acid (QA) moiety-containing side ring (loop 2) was proven to play an important role in carrying out these functions. Previously, we proposed biosynthetic logic for thiostrepton loop 2 and demonstrated the formation mechanism of QA. Herein, we report the discovery and efficient synthesis of
Facile Construction of Quinoline-2-carboxylate Esters through Aerobic Oxidation of Alkyl 4-Anilinocrotonates Induced by a Radical Cation Salt
作者:Xiaodong Jia、Pengfei Li、Yu Shao、Yu Yuan、Wentao Hou、Xiaofei Liu、Xuewen Zhang、Honghe Ji
DOI:10.1002/asia.201700560
日期:2017.7.18
aerobic oxidation of alkyl 4‐anilinocrotonates is described. In the presence of dioxygen, sp3 C−H bonds in 4‐anilinocrotonates can easily be oxidized by using a catalytic amount of a radicalcationsalt, providing a radical intermediate. After further oxidation and domino cyclization, the desired quinoline derivatives were afforded in high yields. This reaction provides a new way to construct the pharmaceutically