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Featured researches published by Praewpan Katrun.


Journal of Organic Chemistry | 2014

Regioselective C2 Sulfonylation of Indoles Mediated by Molecular Iodine

Praewpan Katrun; Charoensak Mueangkaew; Manat Pohmakotr; Vichai Reutrakul; Thaworn Jaipetch; Darunee Soorukram; Chutima Kuhakarn

A facile and general method for regioselective C2 sulfonylation reaction of indoles mediated by iodine is described. The 2-sulfonylated products were obtained up to 96% yield under mild reaction conditions (room temperature, 2 h).


RSC Advances | 2014

Iodine–PPh3-mediated C3-sulfenylation of indoles with sodium sulfinates

Praewpan Katrun; Sakchai Hongthong; Sornsiri Hlekhlai; Manat Pohmakotr; Vichai Reutrakul; Darunee Soorukram; Thaworn Jaipetch; Chutima Kuhakarn

3-(Alkylsulfanyl)- and 3-(arylsulfanyl)indoles were efficiently prepared by the reaction of indoles with sodium sulfinates mediated by iodine–PPh3 in ethanol. The salient features of the present protocol are simplicity, high efficiency, non-anhydrous conditions, environmentally friendly reagents and solvent, and short reaction time.


Journal of Organic Chemistry | 2016

Iodine-catalyzed Sulfonylation of Arylacetylenic Acids and Arylacetylenes with Sodium Sulfinates: Synthesis of Arylacetylenic Sulfones

Jatuporn Meesin; Praewpan Katrun; Chayaporn Pareseecharoen; Manat Pohmakotr; Vichai Reutrakul; Darunee Soorukram; Chutima Kuhakarn

A highly efficient and generally applicable iodine-catalyzed reaction of arylacetylenic acids and arylacetylenes with sodium sulfinates for the synthesis of arylacetylenic sulfones was developed. The methodology has the advantages of a metal-free strategy, easy to handle reagents, functional group tolerance, a wide range of arylacetylenic acids and arylacetylenes, and easy access to arylacetylenic sulfones.


Synthetic Communications | 2013

An Improved Synthesis of Vinyl- and β-Iodovinyl Sulfones by a Molecular Iodine-Mediated One-Pot Iodosulfonation-Dehydroiodination Reaction

Tassaporn Sawangphon; Praewpan Katrun; Korbua Chaisiwamongkhol; Manat Pohmakotr; Vichai Reutrakul; Thaworn Jaipetch; Darunee Soorukram; Chutima Kuhakarn

Abstract An improved one-pot method to synthesize vinyl sulfones from unsaturated systems by using molecular iodine/sodium arenesulfinate/sodium acetate as reagents was described. Vinyl sulfones derived from styrene derivatives were generally obtained in good to excellent yields except for those bearing strong electron releasing substituent. Aliphatic alkenes and activated alkenes gave the corresponding vinyl sulfone products in moderate to good yields. Arylacetylenes yielded the respective β-iodovinyl sulfones in good yields while low yield was observed with aliphatic terminal alkyne. The potentials of the method entail simplicity, short reaction time, non-anhydrous reaction conditions, employing inexpensive, non-metallic reagent and integrating two reactions that are commonly accomplished separately into a single operation. Supplemental materials are available for this article. Go to the publishers online edition of Synthetic Communications® to view the free supplemental file. GRAPHICAL ABSTRACT


European Journal of Organic Chemistry | 2010

PhI(OAc)2/KI-Mediated Reaction of Aryl Sulfinates with Alkenes, Alkynes, and α,β-Unsaturated Carbonyl Compounds: Synthesis of Vinyl Sulfones and β-Iodovinyl Sulfones

Praewpan Katrun; Supanimit Chiampanichayakul; Kanokwan Korworapan; Manat Pohmakotr; Vichai Reutrakul; Thaworn Jaipetch; Chutima Kuhakarn


Tetrahedron | 2013

PhI(OAc)2/KI mediated 1,2-acetoxysulfenylation of alkenes: facile synthesis of β-acetoxysulfides

Charoensak Muangkaew; Praewpan Katrun; Patcharaphon Kanchanarugee; Manat Pohmakotr; Vichai Reutrakul; Darunee Soorukram; Thaworn Jaipetch; Chutima Kuhakarn


Organic and Biomolecular Chemistry | 2015

PhI(OAc)2 mediated decarboxylative sulfonylation of β-aryl-α,β-unsaturated carboxylic acids: a synthesis of (E)-vinyl sulfones

Praewpan Katrun; Sornsiri Hlekhlai; Jatuporn Meesin; Manat Pohmakotr; Vichai Reutrakul; Thaworn Jaipetch; Darunee Soorukram; Chutima Kuhakarn


Synthesis | 2012

IBX/I2-Mediated Reaction of Sodium Arenesulfinates with Alkenes: Facile Synthesis of β-Keto Sulfones

Natthapol Samakkanad; Praewpan Katrun; Thanachart Techajaroonjit; Sornsiri Hlekhlai; Manat Pohmakotr; Vichai Reutrakul; Thaworn Jaipetch; Darunee Soorukram; Chutima Kuhakarn


Tetrahedron | 2016

Decarboxylative sulfonylation of arylpropiolic acids with sulfinic acids: synthesis of (E)-vinyl sulfones

Jatuporn Meesin; Praewpan Katrun; Vichai Reutrakul; Manat Pohmakotr; Darunee Soorukram; Chutima Kuhakarn


Synthesis | 2016

o-Iodoxybenzoic Acid (IBX)–Iodine Mediated One-Pot Deacylative Sulfonylation of 1,3-Dicarbonyl Compounds: A Synthesis of β-Carbonyl Sulfones

Praewpan Katrun; Teerawat Songsichan; Darunee Soorukram; Manat Pohmakotr; Vichai Reutrakul; Chutima Kuhakarn

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