Iridium Porphyrin Catalyzed N–H Insertion Reactions: Scope and Mechanism
作者:Bernie J. Anding、L. Keith Woo
DOI:10.1021/om400098v
日期:2013.5.13
Ir(TTP)CH3 catalyzed N–H insertion reactions between ethyldiazoacetate (EDA) or methyl phenyldiazoacetate (MPDA) and a variety of aryl, aliphatic, primary, and secondary amines to generate substituted glycine esters with modest to high yields. Aniline substrates generally gave yields above 80%, with up to 105 catalyst turnovers, and without slow addition of the diazo reagent. Good yields were also achieved
Ir(TTP)CH 3催化重氮乙酸乙酯(EDA)或苯基重氮乙酸甲酯(MPDA)与各种芳基,脂肪族,伯和仲胺之间的N–H插入反应,以中等至高收率生成取代的甘氨酸酯。苯胺底物的收率通常超过80%,催化剂的转化率高达10 5,并且没有缓慢添加重氮试剂。尽管在某些情况下需要更高的催化剂负载量和胺的缓慢添加,但脂肪族胺也能获得良好的收率。伯胺与EDA反应生成单,双-插入产品,其中任一个的可在高产率下的化学计量比和反应温度的适当选择有选择地来制备。值得注意的是,混合三取代胺RN(CH通过在伯胺中插入1当量的EDA和1当量的MPDA生成2 CO 2 Et)(CHPhCO 2 Me)。使用底物竞争研究,捕获实验和多种光谱技术检查了N–H插入机制。使用具有EDA或MPDA的成对胺进行的底物竞争研究显示Hammett相关性分别具有ρ= 0.15和ρ + = -0.56的斜率以及k H / k D的动力学同位素比=
Unexpected formation of a μ-carbido diruthenium(<scp>iv</scp>) complex during the metalation of phthalocyanine with Ru<sub>3</sub>(CO)<sub>12</sub> and its catalytic activity in carbene transfer reactions
作者:Andrey P. Kroitor、Lucie P. Cailler、Alexander G. Martynov、Yulia G. Gorbunova、Aslan Yu. Tsivadze、Alexander B. Sorokin
DOI:10.1039/c7dt03703a
日期:——
A μ-carbido diruthenium(IV) phthalocyanine complex was prepared for the first time from the free-base octabutoxyphthalocyanine by direct metalation with Ru3(CO)12. The firstexamples of the catalytic activity of Ru(IV) binuclear phthalocyanines were demonstrated by the cyclopropanation of aromatic olefins and carbene insertion into the N–H bonds of aromatic or aliphatic amines with turnover numbers
Substitution pattern in ruthenium octa-n-butoxyphthalocyanine complexes influence their reactivity in N–H carbene insertions
作者:Andrey P. Kroitor、Alexander A. Dmitrienko、Alexander G. Martynov、Yulia G. Gorbunova、Alexander B. Sorokin
DOI:10.1039/d2ob01861f
日期:——
complexes bearing n-OBu substituents in the peripheral or non-peripheral positions are efficient catalysts for the selective double or single carbene insertion to the amine N–H bonds. This complementary reactivity of two Ru complexes can be used for the synthesis of asymmetric tertiary amines and diamines bearing different substituents and has been demonstrated by two examples of readily available primary
Iron(III) Corroles and Porphyrins as Superior Catalysts for the Reactions of Diazoacetates with Nitrogen- or Sulfur-Containing Nucleophilic Substrates: Synthetic Uses and Mechanistic Insights
作者:Iris Aviv、Zeev Gross
DOI:10.1002/chem.200701885
日期:2008.4.28
A thorough mechanistic investigation has been performed on the reactions of primary and secondary amines with diazoacetates, which proceed uniquely quickly and efficiently when catalyzed by iron(III) corroles and porphyrins. Two major differences in relation to other metal-based catalysts are that the iron complexes are not poisoned by excess amine and that metal-carbene intermediates are apparently