Cationic ruthenium complex of the formula [RuCl(2,6-diacetylpyridine) (PPh3)2]BArF and its catalytic activity in the formation of enol esters

TETRAHEDRON LETTERS

卷:59

Article

Stark, Matthew J.¹  Tang, Douglas T.¹  Rath, Nigam P.^1,2  Bauer, Eike B.¹ 

[1] Univ Missouri, Dept Chem & Biochem, One Univ Blvd, St Louis, MO 63121 USA

[2] Univ Missouri, Ctr Nanosci, St Louis, MO 63121 USA

关键词: Ruthenium complexes;    Homogeneous catalysis;    Vinyl esters;    Transition metal Lewis acids;   

DOI  :  10.1016/j.tetlet.2018.01.029

来源: Elsevier

【 摘 要 】

A new ruthenium 2,6-diacetylpyridine complex was synthesized and applied in the atom-economic synthesis of enol esters through Markovnikov-directed addition of carboxylic acids to terminal alkynes. The ruthenium complex [RuCl(dap)(PPh3)(2)]+BArF- was synthesized from [RuCl2(PPh3)(2)] and the corresponding ligand 2,6-diacetylpyridine (dap). The complex was characterized structurally. The new ruthenium complex was utilized under ambient conditions as a catalyst in the Markovnikov addition of carboxylic acids to terminal alkynes to afford the corresponding enol esters in 93% to 52% isolated yields (85 degrees C, 16 h reaction time, 1 mol% catalyst loading). (C) 2018 Elsevier Ltd. All rights reserved.

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