Palladium-catalysed aminocarbonylation/cyclization of iodoalkenes toward N-propargylcarboxamides and oxazoles
作者:Péter Szuroczki、Gábor Mikle、László Kollár
DOI:10.1016/j.mcat.2018.03.015
日期:2018.6
20-iodo-3β-hydroxypregna-5,20-diene) using propargylamine and its derivatives as N-nucleophile. While the carboxamides formed from the parent propargylamine and its 1,1-dimethyl substituted derivative underwent palladium-catalysed ring-closure reaction resulting in the corresponding oxazoles and oxazolines, respectively, the carboxamides formed from N-methylpropargylamine are reluctant toward any cyclization.
由钯(II)前体Pd(OAc)2原位形成的钯(0)络合物在各种碘代烯烃(1-碘环己烯,4-叔丁基-1-碘环己烯)的氨基羰基化反应中被证明是高活性催化体系,2-甲基-1-碘代环己烯,α-碘苯乙烯,2-碘降冰片烯,17-碘androst-16-烯,17-碘-3-甲氧基estra-1,3,5(10),16-四烯,20-碘- (3β-hydroxypregna-5,20-diene),使用炔丙基胺及其衍生物作为N-亲核试剂。尽管由母体炔丙基胺及其1,1-二甲基取代的衍生物形成的羧酰胺进行钯催化的闭环反应,分别导致相应的恶唑和恶唑啉,但由N-甲基炔丙基胺形成的羧酰胺不愿进行任何环化反应。