期刊
JOURNAL OF ORGANIC CHEMISTRY
卷 73, 期 7, 页码 2731-2737出版社
AMER CHEMICAL SOC
DOI: 10.1021/jo702622c
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Here we describe a new family of N-form immonium-type coupling reagents that differ in their carbocation skeleton structure. The N-methylpiperazine derivative failed to form immonium salts, while the thiomorpholine derivative did not give better results than the coupling reagents currently used. The presence of the morpholine had a marked influence on the solubility and stability as well as the reactivity of the reagent. Finally, the fluoroamidinium salt performed extremely well in the presence of only 1 equiv of base, thereby confirming the effect of the proton acceptor in the reaction.
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