Tertiary Phosphines Catalyzed Stereoselective Synthesis of <i>O</i>-Vinyl Ethers from Alkyl Acetylenecarboxylates and Alcohols
作者:Ali Ramazani、Parvaneh Pakravan、Maryam Bandpey、Nader Noshiranzadeh、Ali Souldozi、Alireza Sedrpoushan
DOI:10.1080/10426500701289658
日期:2007.6.1
Protonation of the highly reactive 1:1 intermediates, produced in the reaction between tertiary phosphines (triphenylphosphine and tributylphosphine) and alkyl acetylenecarboxylates, by alcohols (2,2,2-trichloroethanol, propargyl alcohol, and 4-(trifluoromethyl)-benzyl alcohol) leads to vinyltriphenylphosphonium salts, which undergo addition-elimination reaction to produce the corresponding O-vinyl
通过醇(2,2,2-三氯乙醇、炔丙醇和4-(三氟甲基)-苄醇)对叔膦(三苯基膦和三丁基膦)与乙炔羧酸烷基酯反应产生的高反应性 1:1 中间体进行质子化生成乙烯基三苯基鏻盐,经过加成消除反应生成相应的 O-乙烯基醚。NMR 谱图(CDCl3 作为溶剂)表明,对于每种 O-乙烯基醚,化合物都含有两种立体异构体。立体异构体的相对种群由它们的 1H NMR 光谱确定。