123-29-5Relevant articles and documents
Facile oxidation of aldehydes to esters using S·SnO 2/SBA-1-H2O2
Qian, Guang,Zhao, Rui,Ji, Dong,Lu, Gaomeng,Qi, Yanxing,Suo, Jishuan
, p. 834 - 835 (2004)
A highly efficient, mild, and simple procedure has been described for the oxidation of aldehydes to corresponding esters in alcohols with S·SnO2/SBA-1 as catalyst and H2O2 as the oxidant, and the catalytic systems can be used in the preparation of a broad range of esters. Oxidation of aldehydes to corresponding esters utilizing H 2O2 as the oxidant without any metal catalyst is also reported.
PEPTIDOMIMETIC N5-METHYL-N2-(NONANOYL-L-LEUCYL)-L-GLUTAMINATE DERIVATIVES, TRIAZASPIRO[4.14]NONADECANE DERIVATIVES AND SIMILAR COMPOUNDS AS INHIBITORS OF NOROVIRUS AND CORONAVIRUS REPLICATION
-
Paragraph 00455; 00470, (2021/09/26)
Peptidomimetic N5-methyl-N2-(nonanoyl-L-leucyl)-L-glutaminate derivatives, triazaspiro[4.14]nonadecane derivatives and similar compounds for use in methods of inhibiting the replication of noroviruses and coronaviruses in a biological sample or patient, for use in reducing the amount of noroviruses or coronaviruses in a biological sample or patient, and for use in treating norovirus and coronavirus in a patient, comprising administering to said biological sample or patient a safe and effective amount of a compound represented by formulae I or II, or a pharmaceutically acceptable salt thereof. The present description discloses the synthesis and characterisation of exemplary compounds as well as pharmacological data thereof (e.g. page 99 to page 271; examples 1 to 3; compounds A1 to A104 and Bl to B66; tables A to E).
Design, Synthesis, and Study of the Insecticidal Activity of Novel Steroidal 1,3,4-Oxadiazoles
Bai, Hangyu,Jiang, Weiqi,Li, Qi,Li, Tian,Ma, Shichuang,Shi, Baojun,Wu, Wenjun
, p. 11572 - 11581 (2021/10/12)
A series of novel steroidal derivatives with a substituted 1,3,4-oxadiazole structure was designed and synthesized, and the target compounds were evaluated for their insecticidal activity against five aphid species. Most of the tested compounds exhibited potent insecticidal activity against Eriosoma lanigerum (Hausmann), Myzus persicae, and Aphis citricola. Compounds 20g and 24g displayed the highest activity against E. lanigerum, showing LC50 values of 27.6 and 30.4 μg/mL, respectively. Ultrastructural changes in the midgut cells of E. lanigerum were detected by transmission electron microscopy, indicating that these steroidal oxazole derivatives might exert their insecticidal activity by destroying the mitochondria and nuclear membranes in insect midgut cells. Furthermore, a field trial showed that compound 20g exhibited effects similar to those of the positive controls chlorpyrifos and thiamethoxam against E. lanigerum, reaching a control rate of 89.5% at a dose of 200 μg/mL after 21 days. We also investigated the hydrolysis and metabolism of the target compounds in E. lanigerum by assaying the activities of three insecticide-detoxifying enzymes. Compound 20g at 50 μg/mL exhibited inhibitory action on carboxylesterase similar to the known inhibitor triphenyl phosphate. The above results demonstrate the potential of these steroidal oxazole derivatives to be developed as novel pesticides.
Divergent Synthesis of α-Fluorinated Carbonyl and Carboxyl Derivatives by Double Electrophilic Activation of Amides
Dubart, Amaury,Evano, Gwilherm
supporting information, p. 8931 - 8936 (2021/11/17)
A straightforward and divergent entry to α-fluorinated carbonyl and carboxyl derivatives is reported. Upon activation of amides with triflic anhydride and a 2-halo-pyridine and subsequent trapping of the resulting keteniminium ions with nucleophiles followed by a second electrophilic activation with NFSI and final hydrolysis, a range of amides can be transformed to α-fluorinated ketones, esters, and amides under mild conditions. Moreover, this reaction can be performed to yield enantioenriched products with a traceless chiral auxiliary.
Hydrofunctionalization of olefins to value-added chemicals: Via photocatalytic coupling
Fan, Yonghui,Li, Shenggang,Bao, Jingxian,Shi, Lei,Yang, Yanzhang,Yu, Fei,Gao, Peng,Wang, Hui,Zhong, Liangshu,Sun, Yuhan
supporting information, p. 3450 - 3456 (2018/08/06)
A green strategy was developed for the synthesis of various value-added chemicals using methanol, acetonitrile, acetic acid, acetone and ethyl acetate as the hydrogen source by coupling them with olefins over heterogeneous photocatalysts. A radical coupling mechanism was proposed for the hydrofunctionalization of olefins with methanol to higher aliphatic alcohols over the Pt/TiO2 catalyst as the model reaction. C-H bond cleavage and C-C bond formation between photogenerated radicals and terminal olefins were accomplished in a single reaction at high efficiency. Our approach is atomically economical with high anti-Markovnikov regioselectivity and promising application potential under mild reaction conditions.
Hydroethoxycarbonylation of α-olefins at low pressure of carbon(II) oxide in the presence of the PdCl2(PPh3)2–PPh3–AlCl3 system
Suerbaev, Kh. A.,Kudaibergenov, N. Zh.,Vavasori
, p. 707 - 712 (2017/05/29)
High catalytic activity of the PdCl2(PPh3)2–PPh3–AlCl3 system containing AlCl3 as promotor has been demonstrated in the reaction of hydroethoxycarbonylation of hexene-1 and octene-1 at low pressure of carbon(II) oxide (≤25 atm). The reaction yields linear and branched products. The optimal conditions of the process have been elaborated. The target products yield is 84.6–93.8%.
The scope and mechanism of palladium-catalysed Markovnikov alkoxycarbonylation of alkenes
Li, Haoquan,Dong, Kaiwu,Jiao, Haijun,Neumann, Helfried,Jackstell, Ralf,Beller, Matthias
, p. 1159 - 1166 (2016/11/28)
Hydroesterification reactions represent a fundamental type of carbonylation reaction and constitute one of the most important industrial applications of homogeneous catalysis. Over the past 70 years, numerous catalyst systems have been developed that allow for highly linear-selective (anti-Markovnikov) reactions and are used in industry to produce linear carboxylates starting from olefins. In contrast, a general catalyst system for Markovnikov-selective alkoxycarbonylation of aliphatic olefins remains unknown. In this paper, we show that a specific palladium catalyst system consisting of PdX2/N-phenylpyrrole phosphine (X, halide) catalyses the alkoxycarbonylation of various alkenes to give the branched esters in high selectivity (branched selectivity up to 91%). The observed (and unexpected) selectivity has been rationalized by density functional theory computation that includes a dispersion correction.
PROCESS FOR PREPARING ESTERS FROM FORMATES AND OLEFINICALLY UNSATURATED COMPOUNDS
-
Paragraph 0060; 0063, (2014/10/29)
The invention provides a process for preparing esters from formates and olefinically unsaturated compounds with catalysts based on palladium compounds. In addition, the invention discloses a polyphasic reaction mixture and nonyl methyl ester mixtures prepared by the process according to the invention.
A unique palladium catalyst for efficient and selective alkoxycarbonylation of olefins with formates
Fleischer, Ivana,Jennerjahn, Reiko,Cozzula, Daniela,Jackstell, Ralf,Franke, Robert,Beller, Matthias
, p. 417 - 420 (2013/04/24)
Forget about CO! Carbonylations are among the most important homogeneously catalyzed reactions in the chemical industry, but typically require carbon monoxide. Instead, straightforward and efficient alkoxycarbonylations of olefins can proceed with alkyl formates in the presence of a specific palladium catalyst. Aromatic, terminal aliphatic, and internal olefins are carbonylated to give industrially important linear esters at low catalyst loadings. Copyright
Palladium complexes with N-heterocyclic carbene ligands as catalysts for the alkoxycarbonylation of olefins
Roberts, Gina M.,Pierce, Philip J.,Woo, L. Keith
, p. 2033 - 2036 (2013/05/21)
Palladium catalysts, generated from Pd(OAc)2 and 2 equiv of N,N-dialkylbenzimidazolium iodide, are effective for the alkoxycarbonylation of olefins in high yields (>90%). Alkoxycarbonylation of 1-hexene in dimethylacetamide is achieved within 24 h at 110 C using 1 mol % catalyst, 1000 psi CO, and ethanol. Reactions can be prepared in air, without the need of an acid additive to produce ethyl 2-methylhexanoate and ethyl heptanoate in approximately a 2:1 ratio.