2018
DOI: 10.1021/acs.joc.7b02771
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Bedford-Type Palladacycle-Catalyzed Miyaura Borylation of Aryl Halides with Tetrahydroxydiboron in Water

Abstract: A mild aqueous protocol for palladium catalyzed Miyaura borylation of aryl iodides, aryl bromides and aryl chlorides with tetrahydroxydiboron (BBA) as a borylating agent is developed. The developed methodology requires low catalyst loading of Bedford-type palladacycle catalyst (0.05 mol %) and works best under mild reaction conditions at 40 °C in short time of 6 h in water. In addition, our studies show that for Miyaura borylation using BBA in aqueous condition, maintaining a neutral reaction pH is very import… Show more

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Cited by 16 publications
(13 citation statements)
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“…The 4-fluoro substrate ( 2f ) was obtained without any dehalogenated product. The borylation of bromophenol ( 1g ) resulted in a high yield (97%), which is higher than that afforded by previous transition-metal-catalyzed (Pd and Ni) borylation methods. Nitrile ( 1h ) was not reduced under the reaction conditions.…”
mentioning
confidence: 74%
See 1 more Smart Citation
“…The 4-fluoro substrate ( 2f ) was obtained without any dehalogenated product. The borylation of bromophenol ( 1g ) resulted in a high yield (97%), which is higher than that afforded by previous transition-metal-catalyzed (Pd and Ni) borylation methods. Nitrile ( 1h ) was not reduced under the reaction conditions.…”
mentioning
confidence: 74%
“…Using BBA, aryl chloride was converted to boronic acid directly without any deprotection step. Following this research, BBA has been used as a diboron source in the transition-metal-catalyzed borylation of aryl halides. BBA has also been used in photoinduced transition-metal-free borylation reactions (Scheme b). , Under optimized conditions, aryl halides are converted to boronic acid in the presence of hv and BBA. However, the photoinduced reaction requires a quartz reactor and strong light sources.…”
mentioning
confidence: 99%
“…2‐(2,4‐Dimethylphenyl)‐4,4,5,5‐tetramethyl‐1,3,2‐dioxaborolane (8b) : Orange oil. Yield: 362 mg (78 %).…”
Section: Methodsmentioning
confidence: 99%
“…TDB is a frequently used borylation reagent that has rarely been used in the literature for reduction reactions. 19,20 The LTMNPs used for catalysis are stabilized here by graphene quantum dots (GQDs), and for this purpose, a new and green method of synthesis of GQDs is established from commercial glucan.…”
Section: ■ Introductionmentioning
confidence: 99%
“…Experiments using D 2 O instead of water including kinetic isotope effect (KIE) allow confirming and precising the mechanism. TDB is a frequently used borylation reagent that has rarely been used in the literature for reduction reactions. , The LTMNPs used for catalysis are stabilized here by graphene quantum dots (GQDs), and for this purpose, a new and green method of synthesis of GQDs is established from commercial glucan. GQDs can be regarded as small pieces of graphene (less than 100 nm), and they are gaining extensive attraction because of excellent hydrophilicity, low biotoxicity, and stable photoluminescent (PL) properties .…”
Section: Introductionmentioning
confidence: 99%