Heck Reaction of Aryl Bromides with Pent-4-en-2-ol, 2-Phenylpent-4-en-2-ol, or Hept-6-en-3-ol Catalysed by a Palladium-Tetraphosphine Complex
作者:Henri Doucet、Maurice Santelli、Florian Berthiol
DOI:10.1055/s-2005-918427
日期:——
depends on the substituents on the aryl bromide and on the base. Sterically congested and electron-rich aryl bromides gave selectively the linear ketones by migration of the double bond. With electron-poor aryl bromides, the formation of large amounts of (E)-arylalk-1-enol derivatives or side products was observed in some cases. Similar reactions rates were observed with electron-poor and electron-rich
四膦cis,cis,cis-1,2,3,4-四(二苯基膦甲基)环戊烷与[Pd(η 3 -C 3 H 5 )Cl] 2 组合为芳基溴化物的Heck反应提供了非常有效的催化剂与 pent-4-en-2-ol、2-phenylpent-4-en-2-ol 或 hept-6-en-3-ol。对于 pent-4-en-2-ol 或 hept-6-en-3-ol,有利于形成 5-arylpentan-2-one 或 7-arylheptan-3-one 衍生物的选择性分别取决于在芳基溴和碱基上的取代基上。空间拥挤和富电子的芳基溴化物通过双键的迁移选择性地产生线性酮。对于缺电子芳基溴化物,在某些情况下观察到大量 (E)-arylalk-1-enol 衍生物或副产物的形成。用贫电子和富电子芳基溴观察到类似的反应速率。几个反应可以用低至 0.01% 的催化剂进行。芳基溴化物上可以有多种取代基,例如甲氧基、二