Palladium(0)-Catalyzed Allylation of Highly Acidic and Nonnucleophilic Anilines. The Origin of Stereochemical Scrambling When Using Allylic Carbonates
作者:Marcial Moreno-Mañas、Lurdes Morral、Roser Pleixats
DOI:10.1021/jo980209j
日期:1998.9.1
nitroanilines are efficiently allylated under palladium catalysis using allyl carbonates as allylating reagents. A stereochemical study of the reactions of ethyl cis-5-methyl-2-cyclohexenylcarbonate with 4-nitro- and 2,4-dinitroaniline was performed. Bidentate phosphines as stabilizing ligands gave clean retention of configuration whereas triphenylphosphine permitted cis-trans isomerization of the allylic carbonate
酸性苯胺(如二苯胺,吩噻嗪和硝基苯胺)在钯催化下使用碳酸烯丙酯作为烯丙基化试剂可以有效地烯丙基化。进行了立体化学研究顺式5-甲基-2-环己烯基碳酸乙酯与4-硝基和2,4-二硝基苯胺的反应。二齿膦作为稳定的配体,使构型保持清晰,而三苯膦则允许烯丙基碳酸酯的顺反异构化,烯丙基化反应发生在Curtin-Hammet预平衡条件下。