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Abstract
Synth. Commun. 2004, 34, 4037
Improved Synthesis of Tetrakis(2‐thienyl)methane
Kouzou Matsumoto, Toru Tanaka, and Masaji Oda
Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka, Japan
Abstract
Synth. Commun. 2004, 34, 4043
Synthesis of a New Proline‐Derived Organic Catalyst and its Evaluation for Direct Aldol Reaction
Shinji Tanimori, Toshihito Naka, and Mitsunori Kirihata
Graduate School of Agriculture and Life Sciences, Osaka Prefecture University, Osaka, Japan
Aldol condensation of isobutylaldehyde with acetone catalyzed by amide 8 derived from L‐proline gave β‐hydroxy ketone in 80% ee.
Abstract
Synth. Commun. 2004, 34, 4049
A Novel and Convenient Synthesis of Coenzyme Q1
Liang Lu and Fener Chen
Department of Chemistry, Fudan University, Shanghai, P.R.China
A convenient and efficient synthetic route to Coenzyme Q1 starting from 3,4,5‐trimethoxytoluene is described. The key features of this synthesis include the Diels–Alder reaction of Coenzyme Q0 with cyclopentadiene and the introduction of a C5 side chain to the cycloadducts under mild conditions. Coenzyme Q1 was obtained in overall 60% yield.
Abstract
Synth. Commun. 2004, 34, 4055
An Efficient, Simple and Eco‐Friendly Method for the Synthesis of Sydnone‐Containing Thiazoles Under Solvent‐free Conditions
Balakrishna Kalluraya and Ganesha Rai
Dept. of Studies in Chemistry, Mangalore University, Mangalagangothri, Karnataka, India
Novel 4‐substituted‐3‐(3‐substituted sydnolydine‐4‐hydrazono)thiazoles 3a‐l have been synthesized under solvent‐free conditions by grinding the reactants in a mortar with a pestle.
Abstract
Synth. Commun. 2004, 34, 4065
Convenient Synthesis of Labdane and Drimane Analogues with O‐Quinol Functionality
S. Meenakshi, A. Sivaramkrishnan, R. Padmakumar, Shreeshailkumar B. Hadimani and Sujata V. Bhat
Department of Chemistry, Indian Institute of Technology, Powai, Mumbai, India
The Diels–Alder reactions of 4‐carbomethoxy‐o‐benzoquinone with substituted‐1,3‐dienes give high yields of the drimane and labdane analogues containing an orthoquinol moiety.
Abstract
Synth. Commun. 2004, 34, 4077
The Economic Synthesis of Pyridinium Fluorochromate (VI), C5H5NH[CrO3F] (PFC), and Solvent‐free Oxidation of Organic Substrates with PFC
Mihir K. Chaudhuri, Sanjay K. Dehury, Siddhartha S. Dhar, and Upasana B. Sinha
Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, India
The economic synthesis of PFC and facile oxidation of a number of varied substrates including Δ5‐steroids by PFC under solvent‐free conditions are reported.
Abstract
Synth. Commun. 2004, 34, 4089
Imino Diels‐Alder Reactions: Efficient Synthesis Of pyrano and furoquinolines Catalyzed by ZrCl4
M. Mahesh, Ch. Venkateshwar Reddy, K. Srinivasa Reddy, P.V.K. Raju, V.V. Narayana Reddy
Organic Chemistry Division‐II, Indian Institute of Chemical Technology, Hyderabad 500 007, India
Abstract
Synth. Commun. 2004, 34, 4105
A Facile and Efficient Procedure for the Transdithioacetalization of 1,1‐Diacetates Using Pocl‐Montmorillonite as Catalyst
Tong‐Shou Jin, Guang Sun, Yan‐Wei Li, and Tong‐Shuang Li
Department of Chemistry, College of Chemistry and Environmental Science, Hebei University, Baoding, P.R. China
A rapid and efficient method for the transdithioacetalization of 1,1‐diacetates with 1,2‐dithioglycol was described in good to excellent yield catalyzed by POCl3‐montmorillonite.
Abstract
Synth. Commun. 2004, 34, 4111
A Novel and Facile Method to (R)‐ and (S)‐2‐methylpiperazine
Bo Liu,1,2 Guang‐Yu,1 Chun‐Hao Yang,1 Xi‐Han Wu,1 and Yu‐Yuan Xie1
1SKLDR, Shanghai Institute of Materia Medica, SIBS, CAS 555 Zuchongzhi Road, Shanghai 201203, P.R. China
2Graduate School of the Chinese Academy of Sciences, Beijing, China
A novel and efficient synthesis of (R)‐ and (S)‐2‐methylpiperazine from (D)‐ and (L)‐alanine is described.
Abstract
Synth. Commun. 2004, 34, 4119
Further Insight Into the Reactivity of Oxazinones Toward Phosphorus Reagents
Wafaa M. Abdou, Azza A. Kamel, and Maha D. Khidre
Department of Pesticide Chemistry, National Research Centre, Dokki, Cairo, Egypt
Abstract
Synth. Commun. 2004, 34, 4135
Suzuki–Miyaura Reaction of Unactivated Aryl Chlorides Using Benzimidazol‐2‐ylidene Ligands
İsmail Özdemir,1 Yetkin Gök,1 Nevin Gürbüz,1 Engin Çetinkaya,2 and Bekir Çetinkaya2
1Deparment of Chemistry, Inönü University, Malatya, Türkiye
2Department of Chemistry, Ege University, Bornova‐Izmir, Türkiye
A convenient method for Suzuki cross‐coupling reaction is presented, which users a catalyst formed in situ from Pd(OAc)2, air stable bis(benzimidazolium) chlorides.
Abstract
Synth. Commun. 2004, 34, 4145
Zeolite‐Catalyzed Environmentally Friendly Tetrahydropyranylation of Alcohols and Phenols
Adrienn Hegedüs, Ilona Vígh, and Zoltán Hell
Department of Organic Chemical Technology, Budapest University of Technology and Economics, Budapest, Hungary
A simple and environmentally friendly tetrahydropyranylation of various alcohols and phenols at room temperature was elaborated by using a small pore size zeolite.
Abstract
Synth. Commun. 2004, 34, 4153
Mild Microwave‐Assisted Hydrolysis of Acetals Under Solvent‐Free Conditions
Yanhong He, Martin Johansson and Olov Sterner
Department of Organic and Bioorganic Chemistry, Lund University, P. O. Box 124, 22100, Lund, Sweden
A mild and efficient procedure to hydrolyse acetals, also acid‐sensitive acetals, is presented. It is based on silica gel supported pyridiunium tosylate moistened with water used in solvent‐free conditions under microwave irradiation.
Abstract
Synth. Commun. 2004, 34, 4159
Synthesis of 1‐Aryl‐1,2,3,4,5,6‐Hexahydrophosphinine 1‐Oxides
Gy. Keglevich, M. Sipos, D. Lengyel, H. Forintos, T. Körtvélyesi, T. Imre, and L. Tőke
Department of Organic Chemical Technology, Budapest University of Technology and Economics, Budapest, Hungary
The aryl substituent determines how the title products should be prepared.
Abstract
Synth. Commun. 2004, 34, 4171
Efficient Synthesis of Mixed Phosphonates by the Fragmentation‐Related Phosphorylation of Alcohols Applying a 2‐Phosphabicyclo[2.2.2]octa‐5,7‐diene 2‐oxide Precursor
H. Szelke, K. Ludányi, T. Imre, Z. Nagy, K. Vékey, L. Tőke, and Gy. Keglevich
Department of Organic Chemical Technology, Budapest University of Technology and Economics, Budapest, Hungary
Irradiation of the title P‐heterocycle in the presence of alcohols gave the corresponding mixed phosphonates.
Abstract
Synth. Commun. 2004, 34, 4179
Microwave‐Assisted Methylation of Carboxylic Acids and Phenolic Compounds with Dimethyl‐Carbonate Under Solvent‐free Condition
Fatemeh Rajabi and Mohammad R. Saidi
Department of Chemistry, Sharif University of Technology, Tehran, Iran
Abstract
Synth. Commun. 2004, 34, 4199
One‐step Reaction of Friedel–Crafts Acylation and Demethylation of Aryl‐Methyl Ethers Catalyzed by Ytterbium(III) Triflate
Weike Su and Can Jin
College of Pharmaceutical Sciences, Zhejiang University of Technology, Hangzhou, P.R. China
Catalytic amount of ytterbium(III) triflate [Yb(OTf)3] has been used to catalyze Friedel–Crafts acylation and demethylation of aryl‐methyl ethers in one‐step reaction to produce hydroxyacylphenones with moderate yields under mild conditions.
Abstract
Synth. Commun. 2004, 34, 4207
Regioselective Acylation of Secondary Hydroxyl Groups by Means BOP‐Cl
R. Dalpozzo, A. De Nino, L. Maiuolo, A. Procopio, G. Sindona, and A. Tagarelli
Dip. di Chimica, Università della Calabria, Arcavacata di Rende (CS) Italy
Methyl 2‐O‐acyl α‐D‐glucopyranosides are regioselectively formed with good yields by acylation of the correspondent 6‐O‐trityl pyranosides with carboxylic acids and (BOP‐Cl). No acyl migration was observed in the deblocking of the primary hydroxyl group with p‐toluensulfonic acid.
Abstract
Synth. Commun. 2004, 34, 4219
Synthesis of 2‐Ethoxycarbonyl‐2‐Bromo‐4‐Methyl‐4‐Substituted Butanolides and New Spiroheteryl‐Joint Butanolides Based Thereon
Tariel Kochikyan
Department of Chemistry, Yerevan State University, Yerevan, Armenia
On the basis of 2‐bromobutanolides have been obtained spiroheteryl‐joint as well as benzimidazolyl‐ and benzthiazolyl‐substituted butanoildes not described earlier in literature.
Abstract
Synth. Commun. 2004, 34, 4227
Microwave assisted NiCl2 promoted acylation of alcohols
Violetta Constantinou‐Kokotou and Anna Peristeraki
Chemical Laboratories, Agricultural University of Athens, Athens, Greece
A microwave oven acylation of primary, secondary, tertiary alcohols and phenols by NiCl2 is reported.
Abstract
Synth. Commun. 2004, 34, 4233
New Facile Synthesis of 7‐Hydroxy‐6‐amino‐4‐substituted Bezopyran‐2‐ones
Gikas Evagelos,1,2 Parissi‐Poulou Maria,1 Kazanis Michael,1 and Vavagianis Andreas1
1University of Athens, Department of Pharmacy, Division of Pharmaceutical Chemistry, Athens, Greece
2GAIA Research Center, The Goulandris Natural History Museum, 13 Levidou Str., Kifissia, Greece
A new facile synthesis of 6‐amino‐7‐hydroxy‐4‐substituted benzopyranones is described through the von Pechmann reaction. The synthon used is 2,4‐dihydroxyacetanilide yielding 4‐substituted‐6‐hydroxy‐7‐aminocoumarins. The yields obtained were high and the proposed methodology leads to pure products. The selectivity of formation of the desired products can be attributed to the formation of an intramolecular hydrogen bond, which leads to reduced reactivity of the 3‐hydroxyl group.
