Equilibrium shift in the rhodium-catalyzed acyl transfer reactions |
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Authors: | Mieko Arisawa Yui IgarashiHaruki Kobayashi Toru YamadaKentaro Bando Takuya IchikawaMasahiko Yamaguchi |
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Institution: | a Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University, Aoba, Sendai 980-8578, Japan b WPI Research Center, Advanced Institute for Materials Research, Tohoku University, Aoba, Sendai 980-8577, Japan |
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Abstract: | Rhodium/phosphine complexes catalyze equilibrium acyl transfer reactions between acid fluorides, aryl esters, acylphosphine sulfides, and thioesters. The use of appropriate co-substrates to accept heteroatom groups shifted the equilibrium to desired products. Acylphosphine sulfides and aryl esters were converted to acid fluorides using benzoylpentafluorobenzene as the fluoride donor, and the fluorination reaction of thioesters employed (4-tolylthio)pentafluorobenzene. Acid fluorides were converted into acylphosphine sulfides and thioesters using diphosphine disulfides and disulfides/triphenylphosphine, respectively. Aryl esters were obtained from acid fluorides and phenols in the presence of triphenylsilane. Aryl esters, acylphosphine sulfides, and thioesters were also interconverted in the presence of rhodium complexes. These rhodium-catalyzed acyl transfer reactions proceeded under neutral conditions without using acid or base. The involvement of acyl rhodium intermediates in these reactions was suggested by the carbothiolation reaction of thioesters and alkynes. |
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Keywords: | Equilibrium Acyl transfer Rhodium catalyst Co-substrate Co-product |
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