- Deconjugative Alkylation of α,β-Acetylenic Esters by Electrogenerated Base
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Electrolysis of ethyl propiolate (1) and an excess of methyl iodide at a platinum cathode in hexamethylphosphoric triamide (HMPA) or N,N-dimethylformamide (DMF) solution containing tetra-n-butylammonium salt gave the acetylenic esters 2, 3, and 4.Similar electrochemical reactions of α,β-acetylenic esters 2, 5, and 9 with methyl iodide took place in good yields to give the corresponding α,α-dimethyl-β,γ-acetylenic esters 3 and 4, 4, and 10, respectively.Electrochemical reactions of 5 with ethyl, butyl, and allyl iodides also gave α,α-dialkyl β,γ-acetylenic esters 6, 7, and 8, respectively.These facile deconjugative alkylations appeared to take place by the action of the electrogenerated base (EGB) which was formed by the electrochemical reduction of alkyl iodides.Alkyl iodides worked as both a probasic compound of the EGB and as an electrophile.Reaction pathways of the present deconjugative alkylations are also discussed.
- Tokuda, Masao,Nishio, Osamu
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p. 1592 - 1596
(2007/10/02)
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- C-Alkylation of αβ-Acetylenic Esters using Electrochemically Generated Intermediates
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Electrolysis at a platinum cathode of ethyl alk-2-ynoates in the presence of an excess of alkyl iodide in hexamethylphosphoramide or dimethylformamide solution containing tetra-n-butylammonium iodide gave the corresponding non-conjugated dialkylation products, ethyl 2,2-dialkylalk-3-ynoates, in good yield.
- Tokuda, Masao,Nishio, Osamu
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p. 188 - 189
(2007/10/02)
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