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Microwave promoted synthesis of some N-(4-methyl-3-tolylthiazol-2(3H)-ylidene)substituted benzamides

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Chinese Chemical Letters 2009年第9期20卷 1073-1076页

作者： aamer saeed Department of Chemistry Quaid-I-Azam UniversityIslamabad 45320 Pakistan

N-（4-Methyl-3-tolylthiazol-2（3H）-ylidene） substituted benzamides （2a-o） were synthesized in good to excellent yields by the base-catalyzed direct cyclization of corresponding 1-tolyl-3-aryl thioureas （la-o） with 2-bromoacetone through microwave irradiation in a solvent-free medium. Compared to traditional thermal heating, microwave irradiation provides a much more cleaner, efficient and faster method for synthesis of the title compounds. 2009 aamer saeed. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.

关键词： 2-Imino-l,3-thiazoline Green synthesis Microwave-accelerated

A Short Synthesis of Natural Isocoumarin Glucoside Delphoside

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Chinese Journal of Chemistry 2005年第6期23卷 762-766页

作者： saeed,aamer DepartmentofChemistry Quaid-l-AzamUniversity45320lslamabadPakistan

A simple synthesis of delphoside, 3‐methyl‐6‐hydroxy‐8‐ O ‐β‐ D ‐glucopyranosyloxy isocoumarin ( 1 ), isolated from Delphinium spp. is described. 3,5‐Dimethoxyhomophthalic anhydride ( 2 ) on treatment with acetyl chloride in the presence of 1,1,3,3‐tetramethylguanidine (TMG) and triethyl amine afforded the 6,8‐dimethoxy‐3‐methylisocoumarin ( 3 ). Regioselective demethylation of the latter furnished 8‐hydroxy‐6‐methoxy‐3‐methylisocoumarin ( 4 ). Glycosylation with O ‐(2,3,4,6‐tetra‐ O ‐acetyl‐ D ‐glucopyranosyl)trichloroacetimidate in presence of catalytic amount of boron trifluoride etherate followed by deacetylation using 5% potassium carbonate afforded 3‐methyl‐6‐methoxy‐8‐ O ‐β‐ D ‐glucopyranosyloxyisocoumarin ( 6 ) that was finally demethylated to yield delphoside 1 .

关键词： isocoumarin glucoside glycosylation total synthesis delphoside

Microwave-accelerated synthesis of some 1-aroyl-3,5-dimethylpyrazoles

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Chinese Chemical Letters 2008年第11期19卷 1305-1308页

作者： aamer saeed Amara Mumtaz Department of Chemistry Quaid-I-Azam UniversityIslamabad 45320Pakistan

Rapid and highly efficient synthesis of some 1-aroyl-3,5-dimethylpyrazoles is achieved by the cyclocondensation of corresponding aroyl hydrazides with 2,4-pentanedione in the absence of solvent and catalyst, under microwave irradiation. The reaction proceeds rapidly and is completed within 40-70 s giving a series of 1-aroyl-3,5-dimethylpyrazoles derivatives in high yields. All of the compounds have been characterized by FTIR, ^1H NMR, and mass spectroscopy.

关键词： 1,3-Dimethylpyrazole 2,4-Pcntanedione Hydrazidcs Microwave-accelerated

Solvent-free synthesis of some new 2-(3,5-dimethoxy-4-methylphenyl)-5-aryl-1,3,4-oxadiazoles

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Chinese Chemical Letters 2008年第4期19卷 423-427页

作者： aamer saeed Amara Mumtaz Department of Chemistry Quaid-I-Azam UniversityIslamabad 45320Pakistan

An expeditious microwave-accelerated one-step synthesis of some new 2-（3,5-dimethoxy-4-methylphenyl）-5-aryl-1,3,4- oxadiazoles by reaction of 3,5-dimethoxy-4-methyl hydrazide with different carboxylic acids in prese... 详细信息

关键词： 1,3,4-Oxadiazoles 3,5-Dimethoxy-4-methylhydrazide Solvent-free

Synthesis and Crystal Structure of 3,5-Dichloro-N-(2-methoxyphenyl)benzamide

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Chinese Journal of Structural Chemistry 2013年第2期32卷 211-214页

作者： aamer saeed Ulrich Flrke Department of Chemistry Quaid-I-Azam University Department Chemie Fakultt fur Naturwissenschaften Universitt Paderborn

The title compound was synthesized by the direct reaction of 3,5-dichlorobenzoic acid with 2-methoxyaniline in the presence of DCC and HOBT. The structure was supported by the spectroscopic data and unambiguously confirmed by the single-crystal X-ray diffraction studies. It crystallizes from a methanol solution in the monoclinic space group P21/c with unit cell dimensions of a = 4.9369（16）, b = 13.351（5）, c = 20.168（7） A, β = 96.755（8）°, V= 1320.1（8） A^3 and Z=4.

关键词： chlorinated benzamide synthesis crystal structure

Synthesis and Crystal Structure of N-(Biphenyl-2-thiocarbamoyl)-4-(1,3-dichlorophenyl) Carboxamide

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Chinese Journal of Structural Chemistry 2015年第6期34卷 853-857页

作者： aamer saeed ULRICH FL?RKE Department of Chemistry Quaid-I-Azam University Department Chemie Fakult?t fur Naturwissenschaften Universit?t Paderborn

The synthesis of the title molecule was achieved by the reaction of 2,4-dichloro- benzoyl chloride with potassium thiocyanate in 1：1 molar ratio in dry acetonitrile to afford the corresponding isothiocyante in situ followed by the treatment with 2-aminobiphenyl. The structure of the target compound was established by elemental analysis, FTIR, 1H, 13C NMR and mass spectroscopy and unequivocally confirmed by the crystallographic data. The title compound crystallizes in the monoclinic space group P21/n with a = 13.356（2）, b = 7.0761（11）, c = 20.539（3） A, β = 105.723（4）°, V= 1868.5（5） A3 and Z = 4.

关键词： synthesis crystal structure N-(biphenyl-2-thiocarbamoyl)-4-(1,3-dichlorophenyl) carboxamide

Synthesis and Crystal Structure of 2-(4-Oxo-3-o- tolyl-3,4-dihydroquinazolin-2-ylthio)acetohydrazide

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Chinese Journal of Structural Chemistry 2012年第9期31卷 1329-1333页

作者： aamer saeed Shams-ul-Mahmood Ulrich Flörke Department of Chemistry Quaid-I-Azam UniversityIslamabad 45320Pakistan Department Chemie Fakultät fur NaturwissenschaftenUniversität PaderbornWarburgerstrasse 100D-33098 PaderbornGermany

The title compound was synthesized from 3-（2-methylphenyl）-2-thioxo-2,3-dihy- droquinazolin-4（1H）-one （4） which was prepared from 2-methylaniline in two steps. The structure was supported by the spectroscopic data and unambiguously confirmed by single-crystal X-ray diffraction studies. It crystallizes in the orthorhombic space group Pbca with unit cell dimensions a = 6.687（4）, b = 24.788（16）, c = 30.453（19）  V = 5048（5） 3 and Z = 8.

关键词： quinazolinone acetohydrazide synthesis

Deep eutectic ionic liquids based on DABCO-derived quaternary ammonium salts: A promising reaction medium in gaining access to terpyridines

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Frontiers of Chemical Science and Engineering 2019年第3期13卷 586-598页

作者： Muhammad Faisal Azeem Haider Quret ul Aein aamer saeed Fayaz Ali Larik Department of Chemistry Quaid-I-Azam UniversityIslamabadPakistan

Owing to the directional H-bonding,coordination and π-stacking abilities,terpyridines have been widely used as supramolecular tectons in molecular architectures,skeletons in molecular devices and metallopolymers,and are gaining importance in medicinal *** this paper,we have synthesized,characterized and applied deep eutectic ionic liquids (DEILs) based on 1,4-diazabicyclo[2.2.2]octane;triethylenediamine (DABCO)-derived quatemary ammonium salts for the preparation *** DEILs were synthesized through N-alkylation of DABCO with haloalkanes (1-bromopentane or 1-bromoheptane) followed by mixing and heating with methanol or polyethylene glycol as a hydrogen bond *** synthesized DEILs were structurally characterized by IR and *** formation of deep eutectic solvent was confirmed by freezing point depression,it composition was investigated through phase diagram,and its thermal stability was determined through differential scanning calorimetry,derivative thermogravimetry and thermal gravimetric analysis ***,these DEILs were investigated for their effectiveness towards synthesis of 2,2':6',2"-terpyridine,3,2':6',3"-terpyridineand 4,2':6',4"-terpyridine derivatives through Kr(o)hnke *** results show that these three types ofterpyridines can be obtained in reasonable yields (80%-97%) by the one-pot reaction of 2-,3-or 4-acetylpyridine with a variety of aromatic aldehydes in the presence of DEIL as a reaction medium,sodium hydroxide as a base and ammonium acetate as a cyclizing *** methodology is highly efficient and cost-effective for synthesis of symmetrical as well as unsymmetrical ***,these DEILs can be reused several times without an obvious loss of activity and are non-toxic,low-volatile,biodegradable and highly thermally ***,these DEILs as a non-conventional reaction medium for the synthesis of terpyridines provides appealing opportunities to be investigated in the domain of gr

关键词： terpyridine deep eutectic solvent ionic liquid Krohnke reaction DABCO

C–H Arylation using acyl thiourea ligands: Applications in the synthesis of 3,6-diaryl-[1,2,4]triazolo[3,4-b][1,3,4]thiadiazoles

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Chinese Chemical Letters 2016年第1期27卷 37-40页

作者： aamer saeed Pervaiz Ali Channar Qasir Iqbal Jamaluddin Mahar Department of Chemistry Quaid-i-Azam University

Synthesis of a series of new 3,6-diaryl-[1,2,4]triazolo[3,4-b] [1,3,4]thiadiazoles（5a-o） was achieved by phophine free, C-H arylative cross-coupling of 6-aryl-[1,2,4]triazolo[3,4-b][1,3,4]thiadiazoles（4a-o）with suitably substituted iodoanilines using 1-（2-naphthoyl）-3-（4-bromophenyl）thiourea as a *** requisite triazolothiadiazoles（4a-o） were obtained by the condensation of 4-amino-1,2,4-triazole-3-thiol（3） with suitably substituted aromatic acids in the presence of phosphoryl chloride.

关键词： Triazolo[3,4-b]thiadiazoles Acyl thiourea C-H arylative coupling N,N-Dimethylacetamide