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MgCl2/Et3N Base System as a New Catalyst for the Synthesis of a-Hydroxyphosphonate

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Chinese Journal of Chemistry 2012年第4期30卷 827-829页

作者： Tajbakhsh, Mahmood khaksar, samad Tafazoli, Zahra Bekhradnia, Ahmadreza Chemistry Department University of Mazandaran P. O. Box 453 Babolsar Iran Chemistry Department Ayatollah Amoli Branch Islamic Azad University Amol Iran Chemistry Department Payame Noor University Sari Iran Pharmaceuttcal Sctences Research Center Department of Medicinal Chemistry Mazandaran University of Medical Sciences Sari Iran

An efficient and simple synthesis of a-hydroxyphosphonates via reaction of aldehydes and ketones with di- methylphosphite in the presence of MgCI2/Et3N base system is reported. The use of readily available and easy to... 详细信息

关键词： a-hydroxy phosphonates MgC12/Et3N ketones nucleophilic addition

A highly efficient procedure for the synthesis of quinoxaline derivatives using polyvinylpolypyrrolidone supported triflic acid catalyst(***)

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Chinese Chemical Letters 2014年第9期25卷 1287-1290页

作者： samad khaksar Mahmoud Tajbakhsh Milad Gholami Fariba Rostamnezhad Chemistry Department Islamic Azad UniversityAyatollah Amoli Branch Department of Organic Chemistry Faculty of ChemistryUniversity of Mazandaran

A polyvinylpolypyrrolidone supported triflic acid was shown to be useful as a recyclable heterogeneous catalyst for the rapid and efficient synthesis of quinoxaline derivatives in good-to-excellent yields. The catalys... 详细信息

关键词： Quinoxaline Reusable Heterocyclic Heterogeneous

Supramolecular synthesis of 3,4-dihydropyrimidine-2(1H)-one/thiones under neat conditions

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Chinese Chemical Letters 2011年第2期22卷 127-130页

作者： Sekineh Asghari Mahmood Tajbakhsh Behnam Jafarzadeh Kenari samad khaksar Department of Chemistry University of MazandaranBabolsarIran Chemistry Department Islamic Azad UniversityAyatollah Amoli BranchAmolIran

An efficient solvent free method for the synthesis of various 3,4-dihydropyrimidin-2（1H）-one/thiones in excellent yields using sulfonatedβ-cyclodextrine as recyclable catalyst is ***β-cyclodextrine was found to be efficient,recyclable heterogeneous catalyst and showed rate enhancements,high yields and short reaction times in this transformation.

关键词： Cyclodextrine Recyclable catalyst Heterogeneous Dihydropyrimidine

新型五氟苯铵三氟有机催化剂高效合成14-芳基(烷基)-14H-二苯并[a,j]呫吨类化合物和1,8-二氧代氧杂蒽衍生物(英文)

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催化学报 2012年第6期33卷 982-985页

作者： samad khaksar Nosratollah BEHZADI Chemistry Department Ayatollah Amoli BranchIslamic Azad University

A simple and facile synthesis of 14-aryl and alkyl-14H-dibenzo[a,j]xanthenes and 1,8-dioxooctahydroxanthene derivatives has been successfully developed by treatment of β-naphthol or dimedone with aldehydes under mild conditions in the presence of a pentafluorophenyl ammonium triflate(PFPAT) *** catalytic condensation reactions represent green chemical processes and the PFPAT organocatalyst is air-stable,cost-effective,easy to handle,and easily removed from the reaction mixtures.

关键词： pentafluorophenyl ammonium triflate organocatalyst xanthene β-naphthol

One-step,synthesis of Hantzsch esters and polyhydroquinoline derivatives using new organocatalyst

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Chinese Chemical Letters 2010年第5期21卷 563-567页

作者： Seyed Meysam Baghbanian samad khaksar Seyed Mohammad Vahdat Maryam Farhang Mahmood Tajbakhsh Chemistry Department Islamic Azad UniversityRasht BranchPole-taleshanPO Box 41325-3516RashtIran Chemistry Department Islamic Azad UniversityAyatollah Amoli BranchPO Box 678AmolIran Department of Chemistry Mazandaran UniversityBabolsar 47415Iran

Herein we report an efficient organocatalyst for the multicomponent Hantzsch reaction under mild *** product easily isolated by simple filtration and catalyst can be recovered.

关键词： Organocatalyst Four-component coupling reactions Polyhydroquinoline

一个简单、环境友好的硅胶固载硫酸催化Biginelli反应体系(英文)

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催化学报 2012年第9期33卷 1542-1545页

作者： Mahmood TAJBAKHSH Yousef RANJBAR Abdolhosein MASUODI samad khaksar Chemistry Department University of Mazandaran Chemistry Department Payame Noor University Chemistry Department Islamic Azad University

A protocol for the synthesis of 3,4-dihydropyrimidin-2(1H)-ones and-thiones was developed by means of a three-component condensation of an aldehyde,a β-dicarbonyl compound,and urea or thiourea in acetic acid catalyzed by silica-bonded S-sulfonic *** to the classical Biginelli reaction conditions,this new protocol has the advantages of consistently excellent yields and short reaction *** the reaction,the catalyst could be recovered easily and reused with little change in its activity.

关键词： Biginelli reaction silica-bonded S-sulfonic acid dihydropyrimidinone

二氧化钛纳米粒子催化合成Hantzsch酯和多氢喹啉衍生物(英文)

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催化学报 2012年第9期33卷 1517-1522页

作者： Mahmood TAJBAKHSH Ehsan ALAEE Heshmatollah ALINEZHAD Mohammad KHANIAN Fatemeh JAHANI samad khaksar Parizad REZAEE Mahgol TAJBAKHSH Department of Organic Chemistry Faculty of ChemistryUniversity of Mazandaran Gorgan Medical University Chemistry Department Islamic Azad University

1,4-Dihydropyridine and polyhydroquinoline derivatives have been prepared efficiently in a one-pot synthesis via Hantzsch condensation using nanosized titanium dioxide as a heterogeneous *** present methodology offers several advantages such as excellent yields,short reaction times (30-120 min),environmentally benign,and mild reaction *** catalyst can be readily separated from the reaction products and recovered in excellent purity for direct reuse.

关键词： titanium dioxide nanoparticles Hantzsch reaction 1,4-dihydropyridine polyhydroquinoline