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
electrolysis setup gives rise to divergent siteselectivity: a divided electrochemical cell leads to C5-carboxylation, whereas an undivided cell promotes C4-carboxylation. The undivided cell reaction is proposed to operate via a paired electrolysis mechanism9,10, wherein both cathodic and anodic events play critical roles in altering the siteselectivity. Specifically, anodically-generated iodine preferentially