Reactivity and Utility of Allenylphosphonates: Formation of a Novel Hydroperoxide and Propargylic Alcohol and Facile Thiol Addition under Catalyst-Free, Solvent-Free Conditions
作者:K. Kumara Swamy、Manab Chakravarty
DOI:10.1055/s-2007-990794
日期:2007.10
2-(Propa-1,2-dienyl)-, 2-(buta-1,2-dienyl)-, and 2-(3-methylbuta-1,2-dienyl)-substituted 5,5-dimethyl-1,3,2-dioxaphosphinane 2-oxides 1a-c react readily upon heating with thiols under catalyst-free, base-free, and solvent-free conditions to give sulfanyl-substituted phosphonates. The reaction undergoes to essential completion within 15 minutes under microwave radiation. While 1a,b react with 4-chlorothiophenol to afford both 2-[2-(4-chlorophenylsulfanyl)prop-1-enyl]- 12 and 2-[2-(4-chlorophenylsulfanyl)prop-2-enyl]-5,5-dimethyl-1,3,2-dioxaphosphinane 2-oxides 13, 1c gives 2-[2-(4-chlorophenylsulfanyl)-3-methylbut-2-enyl]-5,5-dimethyl-1,3,2-dioxaphosphinane 2-oxide (13d) regioselectively. Molecular oxygen undergoes a novel reaction with the allene 1c to give propargylic alcohol 2-(3-hydroxy-3-methylbut-1-ynyl)-5,5-dimethyl-1,3,2-dioxaphosphinane 2-oxide (16) via the corresponding hydroperoxide; the structures of these were confirmed by X-ray crystallography. The synthetic utility of the sulfanyl-substituted allyphosphonate 13d in the Horner-Wadsworth-Emmons reaction to afford synthetically valuable sulfanyl-substituted buta-1,3-dienes and a conjugated triene is demonstrated.
在无催化剂、无碱和无溶剂的条件下,2-(丙-1,2-二烯基)-、2-(丁-1,2-二烯基)-和 2-(3-甲基丁-1,2-二烯基)-取代的 5,5-二甲基-1,3,2-二氧磷烷 2-氧化物 1a-c 与硫醇加热后很容易发生反应,生成硫代膦酸盐。在微波辐射下,反应在 15 分钟内基本完成。而 1a,b 与 4-氯苯硫酚反应后,可得到 2-[2-(4-氯苯基硫酰)丙-1-烯基]-12 和 2-[2-(4-氯苯基硫酰)丙-2-烯基]-5,5-二甲基-1、13、1c 和 2-[2-(4-氯苯基硫基)-3-甲基丁-2-烯基]-5,5-二甲基-1,3,2-二氧磷杂环戊烷 2-氧化物(13d)发生了区域选择性反应。分子氧与烯烃 1c 发生新型反应,通过相应的过氧化氢生成丙炔醇 2-(3-羟基-3-甲基丁-1-炔基)-5,5-二甲基-1,3,2-二氧磷杂环戊烷 2-氧化物(16);X 射线晶体学证实了这些反应的结构。在 Horner-Wadsworth-Emmons 反应中,硫代烯基膦酸盐 13d 的合成用途得到了证实,它可以制备出具有合成价值的硫代丁-1,3-二烯和共轭三烯。