Pyridinium Iodochloride: An Efficient Reagent for Iodination of Hydroxylated Aromatic Ketones and Aldehydes

Direct iodination of several reactive aromatic compounds like hydroxy substituted acetophenones and aldehydes with pyridinium iodochloride (PyICl) proceeded smoothly to afford the corresponding aromatic iodides in good to excellent yield. Pyridinium iodochloride has been found to be an efficient solid iodinating reagent with no hazardous effect and it can be handled safely.     

Ionic Liquid Iodinating Reagent for Mild and Efficient Iodination of Aromatic and Heteroaromatic Amines and Terminal Alkynes

Hexamethylene bis(N-methylimidazolium) bis(dichloroiodate) (HMBMIBDCI), an ionic liquid iodinating reagent, have been prepared and characterized. Its ability to perform iodination reactions with a variety of substrates has been explored. In general, iodination reactions of aromatic and heteroaromatic amines proceed with good yields in the absence of solvent. Reactions of terminal alkynes in the presence of 1,8-diazabicyclo [5.4.O] undec-7-ene and tetrahydrofuran have been investigated as well.

[Supplementary materials are available for this article. Go to the publisher's online edition of Synthetic Communications® for the following free supplemental resource: Full experimental and spectral details.]     

Iodination of Aromatic Amines with Iodine and Silver Sulfate

Iodination of aromatic amines with iodine / silver sulfate at room temperature gives iodo-products in good (46-96%) yield.     

A Convenient Synthesis of Aromatic Fluoride by Thermal Stable Pyridinium Phase-transfer Catalyst

Fluoroorganic compounds have been applied as useful intermediates in industry. Here, we use the PTC method for fluorination of aromatic halide by inorganic fluorides involv- ing a halogen-exchange. This is a convenient and attractive synthetic way to obtain fluoro compounds, because inorganic fluorides such as potassium fluoride is safe to be handled and cheap1. However, owing to poor solubilities of inorganic fluorides in organic solvents, the halogen-exchange fluorination often requires …     

二碘化钐有效催化芳胺成胍反应的研究

二碘化钐作为易得的路易斯酸型预催化剂,可有效催化芳胺和碳二亚胺的反应,在温和条件下以高收率得到一系列胍。     

A Convenient Method for the Conversion of Amines to Carbamates

Treatment of primary or secondary amines with bis(trimethylsilyl)acetamide followed by addition of methyl, vinyl, or 2,2,2-trichloroethyl chloroformate provides a convenient method for the preparation of the corresponding carbamates.     

A Convenient Method of Benzylic Oxidation with Pyridinium Chlorochromate

Oxidation of indans and tetralin derivatives to their corresponding indanones and tetralones is of considerable value i n organic synthesis and many methods have been reported for accomplishing this conversion. Traditionally these oxidations are performed with chromic acid in acetic acid and the yields in general are moderate. Recently Eisenbraun4 has studied indetail the benzylic oxidation with the Jones reagent and compared the selectivity and yield of oxidation with other chromium(V1) reagents like bipyridinim chlorochrmate, (BiPCC). It was found that there was no improvement in yield and in the case of BiPCC a molar ratio 16% 1 (oxidant: substrate) was employed to get     

Convenient and Efficient Method for the Iodination of Benzylic and Aliphatic Alcohols by Using Al(HSO4)3/KI in Nonaqueous Solution

A simple and efficient method for the iodination of benzylic and aliphatic alcohols by using Al(HSO₄)₃/KI in n‐hexane as solvent is reported. Mild reaction conditions and good to excellent yields of the products are the noteworthy advantages of the method.     

A Mild and Efficient Method for the Carbethoxylation of Amines

3-Carbethoxy-1,3-thiazolidine-2-thione [CTT(2)] has been prepared by treatment of 1,3-thiazolidine-2-thione (3) with ethyl chloroformate and triethylamine. CTT(2) shows high reactivity towards the amines.     

Efficient and Convenient Method for the Synthesis of Symmetrical Triindolylmethanes Catalyzed by Iodine

Indoles reacted with triethyl orthoformate in the presence of a catalytic amount of iodine at room temperature to give the corresponding symmetrical triindolylmethanes (TIMs) in good to high yields.     

An Efficient and Convenient Cyclization Method for the Synthesis of Flavans

Flavansrefertoalargegroupofnaturallyoccurringcompoundspossessinga2-phenyl-chromannucleus.Naturallyoccurringflavansexhibitanumberofimportantbiologicalactivitieswhichifexploitedproperly,mayleadtovaluablenewdrugsoragrochemicals'.Inflavansynthesis,thekeystepistoconstructthe3,4-dihydrobenzopyranring-Variousmethodshavebeendevelopedfortheringformation,butmostoftheminvolvemultiplestepsandgivelowoverallyields2.Inthispaper,BF3wasusedforthefirsttimeasanefficientcatalysttoformthepyranringfroml,3-diaryIp…     

A Mild and Efficient Method for Selective Acetylation of Amines

Primary and secondary amines were acetylated under mild conditions by means of 3-acetyl-1,3-thiazolidine-2-thione [ATT(1)]. The reaction was successfully applied to selective acetylation of a primary amino group of diamines containing a primary and a secondary amino groups or exclusive N-acetylation of amino alcohols.     

An Efficient Method for the Preparation of Sulfonamides from Sodium Sulfinates and Amines

Sulfonamides have a special role on medicine due to their broad biological activities, as bacterial infections, diabetes mellitus, oedema, hypertension prevention and treatment. In addition, sulfonamides are also useful in herbicides and pesticides. Herein, we communicate an efficient strategy for the preparation of sulfonamides via NH₄I‐mediated amination of sodium sulfinates. This new method provides a general and environmentally friendly access to sulfonamide compounds and tolerates a wide range of functional groups.     

Synthesis of N-Iodosuccinimide and Its Application in H2SO4 as Efficient Iodination Reagent for Deactivated Aromatic Compounds

Russian Journal of Organic Chemistry -     

Convenient and Efficient Method for the Synthesis of N-Heteroaryl Aminonaphthols under Solvent-Free Conditions

A convenient, efficient and green synthesis of N‐heteroaryl aminonaphthols has been developed by one‐pot, three‐component condensation of β‐naphthol, heteroaryl amines and substituted benzaldehydes under solvent‐free conditions at elevated temperature. The advantages of these reactions are simplicity of the reaction procedure, short reaction times, simple work‐up, catalyst‐free conditions and pure products in good to excellent yields.     

A Practical Iodination of Aromatic Compounds by Using Iodine and Iodic Acid

This article describes simple and efficient method for the iodination of different aromatic amines, hydroxy aromatic aldehydes, hydroxy acetophenones and phenols using iodine and iodic acid in ethanol as a solvent. Notable advantages include mild reaction condition, no need of catalyst, short reaction time, simple practical procedure, giving excellent yield of the product.     

Efficient and Convenient Method for Workup of Ozonolysis Reaction Using Sodium Hydrosulfite

Abstract

An efficient and convenient method is reported for reductive workup of the ozonolysis reaction using sodium hydrosulfite. Comparisons were made between triethylamine and methyl sulfide for their use as a quenching reagent in the ozonolysis of a variety of alkenes.     

Improved Method for the Iodination of Sydnones

Iodination at the sydnone C-4 position has been achieved in good yields for a series of 3-arylsydnones using N-iodosuccinimide in acetic acid.

[Supplementary materials are available for this article. Go to the publisher's online edition of Synthetic Communications® for the following free supplemental resources: Full experimental and spectral details.]