Merging Asymmetric Henry Reaction with Organocatalytic Cascade Reaction for the Construction of a Chiral Indolizidine Alkaloid Skeleton
作者:Yirong Zhou、Qin Yang、Jian Shen、Xin Chen、Yiyuan Peng、Yuefa Gong
DOI:10.1021/jo502379v
日期:2015.2.6
A sequential reaction combining the copper-catalyzed asymmetric Henry reaction with the organocatalytic Michael addition–hemiacetalization cascade reaction was developed. The C1-symmetric chiral diamine L1–copper complex was responsible for the first highly enantioselective Henry reaction, while diphenylprolinol silyl ether A acted as effective organocatalyst for the second cascade reaction between
Synthesis, spectral characterization and crystal structure of Ni(II) pyridoxal thiosemicarbazone complexes and their recyclable catalytic application in the nitroaldol (Henry) reaction in ionic liquid media
The molecular structure of the complex [Ni(L2)PPh3] (2) was determined by single-crystal X-ray diffraction, which reveals a distorted square planar geometry around the nickel(II) ion. The nitroaldol reaction was studied in detail using the nickel(II) complexes as catalysts in a homogeneous solution formed by an ionic liquid and methanol. The effect of solvent, ionic liquid, time, temperature, catalyst
Design and development of novel Co‐MOF nanostructures as an excellent catalyst for alcohol oxidation and Henry reaction, with a potential antibacterial activity
detected to be excellent for primary and secondary alcoholsoxidationreaction with high yields under solvent‐free conditions. Moreover, UoB‐3 was highly active for Henryreaction of different aldehydes with nitromethane in water as a green solvent. The nanocatalyst can be recycled for five consecutive cycles without losing its activity and structural rigidity. The antibacterialactivity of UoB‐3 nanostructures
S-Benzyl isothiouronium chloride as a recoverable organocatalyst for the reduction of conjugated nitroalkenes with Hantzsch ester
作者:Quynh Pham Bao Nguyen、Jae Nyoung Kim、Taek Hyeon Kim
DOI:10.1016/j.tet.2012.05.104
日期:2012.8
The reduction of conjugated nitroalkenes into nitroalkanes with Hantzsch ester using S-benzyl isothiouronium chloride as a recoverableorganocatalyst was successfully accomplished with high yield and excellent chemoselectivity.
Mn(OAc)2/Schiff base as a new efficient catalyst system for the Henry reaction of nitroalkanes with aldehydes
作者:Guang Peng Zhou、Yong Hai Hui、Ning Ning Wan、Qiu Ju Liu、Zheng Feng Xie、Ji De Wang
DOI:10.1016/j.cclet.2012.04.018
日期:2012.6
A series of novel Schiff bases bearing triazole structure were synthesized and characterized by IR and NMR. Mn(OAc)(2)/Schiff base efficiently catalyzed Henry reaction of nitroalkanes with aldehydes to produce the corresponding products of beta-nitroalcohols, under mild conditions with high yields (up to 99%). A reaction mechanism is proposed based on the experimental results. (C) 2012 Zheng Feng Xie. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.