Heck Vinylations Using Vinyl Sulfide, Vinyl Sulfoxide, Vinyl Sulfone, or Vinyl Sulfonate Derivatives and Aryl Bromides Catalyzed by a Palladium Complex Derived from a Tetraphosphine
作者:Henri Doucet、Maurice Santelli、Ahmed Battace、Touriya Zair
DOI:10.1055/s-2006-950244
日期:2006.10
affords an efficient catalyst for the Heck reaction ofsulfur-containing alkenes with aryl bromides. The rates and yields of the reactions strongly depend on the oxidation state of the sulfur atom. Using vinyl sulfides with 1 mol% catalyst, low to moderate yields of arylated alkenes were obtained. Phenyl vinyl sulfoxide was found to be more reactive, and satisfactory yields of (E)-[2-(phenylsulfinyl)vinyl]benzene
硫化合物对催化性能的不利影响是众所周知的。四膦cis,cis,cis-1,2,3,4-四[(二苯基膦基)甲基]环戊烷与烯丙基氯钯二聚体结合为含硫烯烃与芳基溴化物的Heck反应提供了有效的催化剂。反应的速率和产率很大程度上取决于硫原子的氧化态。使用具有 1 mol% 催化剂的乙烯基硫化物,获得了低至中等收率的芳基化烯烃。发现苯基乙烯基亚砜更具反应性,并且使用 1 mol% 催化剂获得了令人满意的 (E)-[2-(苯基亚磺酰基)乙烯基]苯衍生物产率。使用甲基乙烯基砜,使用 1-0.1 mol% 的催化剂获得了非常高产率的 (E)-[2-(甲基磺酰基)乙烯基]苯衍生物。