Chalcogenation of 1,4-dichlorobut-2-yne with organic dichalcogenides in the system hydrazine hydrate–KOH
作者:E. P. Levanova、V. S. Vakhrina、V. A. Grabel’nykh、I. B. Rozentsveig、N. V. Russavskaya、A. I. Albanov、L. V. Klyba、N. A. Korchevin
DOI:10.1007/s11172-015-1121-1
日期:2015.9
A reaction of organic dichalcogenides R2Y2 (R = Ph, Bn, Pr; Y = S, Se) with 1,4-dichlorobut-2-yne in the system hydrazine hydrate–KOH leads to four principal products: 1,4-bis(organylchalcogenyl)but-2-ynes, 1-organylchalcogenylbut-1-en-3-ynes, 4-organylchalcogenylbut-1-en-3-ynes, and 3(5)-methylpyrazole. The selectivity of the formation of individual products is determined by the ratio of the substrates used and the reaction temperature. A plausible mechanism of chalcogenation considered in the work agrees with the effect of the nature of chalcogene atoms and organic substituents R on stability of intermediates and products. The stabilization of carbanions by α chalcogene-containing groups corresponds to the following order: PhS > PhSe > BnS > BnSe > PrS.
有机二磺酰亚胺R2Y2(R=Ph、Bn、Pr;Y=S、Se)与1,4-二氯丁炔-2在系统联氨氢水合物-KOH中的反应主要产生四种产物:1,4-双(有机磺酰亚胺基)丁炔-2、1-有机磺酰亚胺基丁烯-1-炔-3、4-有机磺酰亚胺基丁烯-1-炔-3和3(5)-甲基吡唑。单个产物的选择性取决于所用底物的比例和反应温度。本文考虑的加磺酰亚胺化作用的可行机制与磺酰亚胺原子和有机取代基R的性质对中间体和产物稳定性的影响相符。由α-磺酰亚胺基团稳定碳阴离子的顺序为:PhS > PhSe > BnS > BnSe > PrS。