The synthesis of spirocyclic compounds by regiospecific palladium catalysed cyclisation reactions
作者:Ronald Grigg、Visuvanathar Sridharan、Paul Stevenson、Sukanthini Sukirthalingam
DOI:10.1016/s0040-4020(01)81034-6
日期:1989.1
Enamides derived from o-iodobenzoic acid and Z-3-bromoacrylic acid undergo regiospecific palladium catalysed exo-trig cyclisation onto a proximate alkene to give spirocyclic products in good to excellent yield. Double bond isomerisation in the product is not usually observed and is retarded by the addition of tetraethylammonium chloride which also allows the reaction to be carried out under milder
衍生自邻碘苯甲酸和Z-3-溴丙烯酸的酰胺经过区域特异性钯催化的exo-trig环化反应生成邻近的烯烃,以良好或优异的收率得到螺环产物。通常不观察到产物中的双键异构化,并且通过添加氯化四乙铵来阻止双键异构化,这也使得该反应可以在较温和的条件下进行。