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1.
Synthesis of dibenzoxanthenes through condensation of β-naphthol with various aromatic and aliphatic aldehydes in ethanol as an ecofriendly solvent using RuIII as catalyst is reported.

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ACKNOWLEDGEMENT

Support of this study by Research Council of Guilan University is gratefully acknowledged.  相似文献   

2.
The dehydration of aldoximes and amides, and oxidation of benzoin are accomplished in one-pot using in situ–generated Burgess-type reagent.

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ACKNOWLEDGMENT

This work was supported by the Council of Scientific and Industrial Research, Government of India, in the form of Research Grant No. 01(1989)/05/EMR-II.  相似文献   

3.
Aryl ketones are readily deoxygenated to their corresponding aryl alkanes upon treatment with Raney nickel catalyst in boiling 2-propanol.

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ACKNOWLEDGMENTS

The authors gratefully acknowledge financial support from the Covenant College Kaleo Center. In addition, we are indebted to the W. R. Grace Company, Chattanooga, for the generous donation of Raney nickel catalyst.  相似文献   

4.
An improved synthesis of Boc-monoprotected 5- and 6-amino-2-azanorbornanes is reported. The synthetic scheme consists of five steps and allows multigram quantities of the title compounds to be obtained. The regio- and stereochemistries of the products are established by two-dimensional NMR experiments.

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ACKNOWLEDGMENT

The authors are thankful to Mr. Vitaliy Polovinko for the 2D NMR experiments.  相似文献   

5.
An asymmetric synthesis of (S,S,S)-2-aza-bicyclo-[3.3.0]-octane-3-carboxylic acid benzyl ester 2 as an intermediate of angiotensin converting enzyme (ACE) inhibitor, ramipril 1, is described.

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ACKNOWLEDGMENTS

We greatly appreciate Prof. Dieter Enders for his promptness in sharing documents related to SAMP. We are also thankful to the management of Dr. Reddy's Laboratories Ltd. for supporting this work.  相似文献   

6.
V. Srinivas 《合成通讯》2013,43(6):806-811
An efficient one-pot synthesis of 2-amino-5,10-dihydro-5,10-dioxo-4-phenyl-4H-benzo[g]chromene derivatives has been achieved by the reaction of 2-hydroxynaphthalene-1,4-dione, cyanothioacetamide, and aromaticaldehyde in EtOH at room temperature catalyzed by ZnCl2. The structures of the products were characterized by infrared, 1H NMR, mass, and elemental analysis.

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ACKNOWLEDGMENT

We thank the University Grants Commission, New Delhi (F. No. 32-201/2006 (SR)), for financial support.  相似文献   

7.
In this study, silica-supported titanium tetrachloride was prepared and used as a novel catalyst for rapid and efficient synthesis of 2,4,5-trisubstituted imidazoles by a three-component, one-pot condensation of 1,2-diketones and aryl aldehydes in excellent yield under solvent-free conditions using conventional heating or microwave irradiation.

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ACKNOWLEDGMENT

We gratefully acknowledge the financial support from the Research Council of the University of Kashan.  相似文献   

8.
Dao M. Nguyen 《合成通讯》2013,43(12):1759-1771
Copper iodide was employed as an efficient catalyst for the synthesis of 1,2,3-triazole derivatives of podocarpic acid at room temperature through “click” chemistry cycloaddition reactions of methyl O-propargylpodocarpate and propargyl O-propargylpodocarpate with azides.

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ACKNOWLEDGMENTS

This work was supported by the Chemistry Department of the University of Central Florida. The authors thank the Nebraska Center for Mass Spectrometry for providing the MS data.  相似文献   

9.
Jin Chen 《合成通讯》2013,43(9):1376-1380
A new synthesis of 3-methoxypropanal from glycerol was presented. With this new approach, the conversion of glycerol to 3-methoxypropanal can be effected in moderate yield using catalysts of copper sulfate and polyethylene glycol (PEG).

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ACKNOWLEDGMENT

We thank Dr. Xu Zhang of Wuhan University for helpful discussions.  相似文献   

10.
A three-component reaction of trialkyl(aryl) phosphites, dialkyl acetylenedicarboxylates, and arylsulfonamides is described as a simple and efficient route for the synthesis of dialkyl 2-(arylsulfonylamino)-3-(dialkoxyphosphoryl)-succinates in good yields.

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ACKNOWLEDGMENT

We gratefully acknowledge financial support from the Research Council of Islamic Azad University of Yazd of Iran.  相似文献   

11.
Fui-Fong Yong 《合成通讯》2013,43(9):1293-1300
A recyclable siloxy-L-serine organocatalyst has been developed to catalyze the asymmetric direct three-component Mannich reactions in ionic liquid hmim[PF6], furnishing the β-amino carbonyl scaffold in high enantio- and diastereoselectivities. The direct Mannich reaction between a selection of aromatic aldehydes and ketones resulted in good yields and high enantioselectivities.

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ACKNOWLEDGMENT

We thank the National Institute of Education (RP05/06 TYC), Nanyang Technological University, for their generous financial support.  相似文献   

12.
In a short reaction time, acyl chlorides and dry tetrahydrofuran react in the presence of a catalytic amount of magnesium turnings (Mg) at 25 °C to give 4-chlorobutyl esters in excellent yields.

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ACKNOWLEDGMENT

Krishnappa Manjula is thankful to V. P. Jayashankara for his timely help and encouragement.  相似文献   

13.
A protocol has been developed for the synthesis of the linear naphthopyran 16, by the TiCl4-catalyzed isomerization of 2,5-dimethyl dioxolane 1, having a methoxy group at position 1′ and a bromine atom at position 4′ of the naphthyl precursor to favor isomerization at position 2′.

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ACKNOWLEDGMENT

The authors thank the Cape Peninsula University of Technology and the Cannon Collins Trust for financial assistance.  相似文献   

14.
An efficient one-pot synthetic strategy for 2-aminobenzoxazoles was developed from isothiocyanates and 2-aminophenol using triflic acid as a cyclodesulfurizing reagent.

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ACKNOWLEDGMENT

We are thankful to the Department of Science and Technology, government of India, for the research funding.  相似文献   

15.
A simple and efficient method has been developed for the synthesis of sulfonamide phosphonates from N-tosyl aldimines and dimethyl trimethylsilyl phosphite at 0 °C in the presence of Amberlyst-15 as a heterogeneous catalyst.

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ACKNOWLEDGMENT

The authors thank the University Grants Commission, New Delhi, for financial assistance.  相似文献   

16.
Reaction of 2-acetyl-1-naphthol with aliphatic amines under microwave irradiation gave the corresponding imines (Schiff bases), which were treated with triphosgene to give 4-methylene-1,3-naphthoxazines in good yields.

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ACKNOWLEDGMENT

The author is thankful to Hamad Z. Alkhathlan, professor of chemistry, King Saud University, Udaipur, for valuable suggestions and guidance.  相似文献   

17.
A series of 1,2,4-triazolopyridines have been prepared by oxidative intramolecular cyclization of heterocyclic hydrazones with [bis(trifluroacetoxy)iodo]benzene. General applicability of this simple transformation was confirmed by synthesis of 1,2,4-triazolo[4,3-a]pyridine. The advantages of this protocol are the nontoxicity of catalyst and shorter reaction time to obtain good preparative yield.

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ACKNOWLEDGMENT

The author is thankful to Indian Institute of Technology Mumbai, for providing the 1H NMR facility.  相似文献   

18.
A practical method for the synthesis of carbamates from ureas and organic carbonates was developed with 100% atom economy using La2O3/SiO2 as catalyst without any additional solvent. The scope of the protocol is demonstrated in the synthesis of 14 carbamates with various functional groups in excellent yields (76–95%).

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ACKNOWLEDGMENTS

This work has been financially supported by the National Natural Science Foundation of China (No. 20503037). We thank Bayer Material Science for financial support.  相似文献   

19.
A one-pot, multicomponent reaction of aldehydes, dimedone, and β-naphthols is described for the preparation of 12-aryl- or 12-alkyl-8,9,10,12-tetrahydrobenzo[α]xanthen-11-one derivatives using ammonium chloride as a mild, inexpensive, and environmentally benign catalyst under solvent-free conditions. Different types of aldehyde and β-naphthol derivatives are used in the reaction, and in all cases the products were synthesized successfully.

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ACKNOWLEDGMENT

We gratefully acknowledge the financial support from the Research Council of Arak University.  相似文献   

20.
A new and efficient method for the demethylation of 6-membered aza-heterocyclic methyl ethers is described using lithium chloride and para-toluenesulfonic acid. This process is chemoselective for aza-heterocyclic methyl ethers in the presence of aryl methyl ethers.

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ACKNOWLEDGMENTS

We thank the Analytical Chemistry Department of New Drug Discovery Research, Ranbaxy Research Laboratories, for spectral and chromatographic data. We also thank Dr. Jitendra Sattigeri for helpful suggestions and comments.  相似文献   

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