Synthesis of C-15 Vindoline Analogues by Palladium-Catalyzed Cross-Coupling Reactions
摘要:
Described are general protocols for the rapid construction of various C-15-substituted analogues of vindoline using palladium-catalyzed cross-coupling reactions. The required bromo- and iodovindolines were prepared in high yield by the reaction of vindoline with N-bromosuccinimide or N-iodosuccinimide, respectively. The study not only led to the preparation of a number of structurally novel vindoline analogues but also opens the door to new strategies for the synthesis of vinblastine, vincristine, and related anticancer agents. Also described is the conversion of ent-tabersonine to ent-vindoline.
Pd(II)-catalyzed cascade Heck/intramolecular C(sp)–H amidation reaction: An efficient route to 4-aryl-2-quinolinones
作者:Chengqian Xiao、Ziyi Wang、Min Lei、Lihong Hu
DOI:10.1016/j.tet.2016.11.075
日期:2017.1
A Pd(II)-catalyzed cascade Heck/intramolecularC(sp2)–Hamidation reaction is described for the synthesis of 4-aryl-2-quinolinone derivatives. Substituted cinnamamide containing 2-(pyridin-2-yl)ethanamine unit reacts with aryl iodide to form intermediate by Heck reaction. Then, the intermediate takes place intramolecularamidation via C(sp2)–H activated process promoted by orientation group.
A facile and efficient method for the synthesis of alkynone by carbonylative Sonogashira coupling using CHCl<sub>3</sub>as the CO source
作者:Guanglong Sun、Min Lei、Lihong Hu
DOI:10.1039/c6ra02424f
日期:——
A facile and efficient method for the synthesis of alkynones by a Pd-catalyzed carbonylative Sonogashira coupling reaction starting from aryl iodide, terminal alkyne and chloroform (CHCl3) as the CO source is described. This procedure proves that CHCl3 is a cheap and efficient CO source in the presence of CsOH·H2O as the base. Furthermore, it is applied successfully for the modification of natural
Palladium-Catalyzed Formylation of Aryl Iodides with HCOOH as CO Source
作者:Guanglong Sun、Xue Lv、Yinan Zhang、Min Lei、Lihong Hu
DOI:10.1021/acs.orglett.7b01882
日期:2017.8.18
facile and practical method for the synthesis of aromatic aldehydes by palladium-catalyzedreductivecarbonylation starting from aryl iodides and HCOOH is described. Compared to the known formylation procedure, HCOOH serves not only as the most convenient and environmental-friendly C1 source but also as the reviving agent in the reductive elimination process of a Pd-catalyst. Furthermore, this procedure
AbstractA practical and efficientpalladium-catalyzedcarbonylative Sonogashira cross-coupling reaction for the synthesis of alkynones fromaryl iodides, alkynes, and formic acid as the CO source has been described. Under the assistance of PPh3/I2, formic acid can be used as the CO source for synthesis of alkynones in moderate–good yields. Furthermore, it is also successfully applied for the modification
摘要已经描述了一种实用且有效的钯催化的羰基化Sonogashira交叉偶联反应,用于从芳基碘化物,炔烃和甲酸作为CO源合成炔烃。在PPh 3 / I 2的辅助下,甲酸可以用作CO来源,以中等至良好的产率合成炔酮。此外,它还成功地用于修饰天然产物,如长春花碱和大黄素,以获得相应的产物。 图形概要
Ullmann-type C–N coupling reaction catalyzed by CuI/metformin
作者:Chao Zhang、Zhajun Zhan、Min Lei、Lihong Hu
DOI:10.1016/j.tet.2014.10.014
日期:2014.11
A facile and efficient method for Ullmann-type C-N coupling reaction of amine and aryl halide catalyzed by CuI/metformin in EtOH is described. The advantages of this method are the use of an inexpensive and readily available catalyst and ligand, easy workup, shorter reaction time, improved yields, and the use of green solvent. Furthermore, this procedure is applied successfully for the modification of natural products, such as Vindoline and Tabersonin. (C) 2014 Elsevier Ltd. All rights reserved.