N‐alkyl hydroxylamines are effective reagents for the amination of organoboronic acids in the presence of trichloroacetonitrile. This amination reaction proceeds rapidly at roomtemperature and in the absence of added metal or base, it tolerates a remarkable range of functional groups, and it can be used in the late‐stage assembly of two complex units.
Heavier Alkaline Earth Catalysts for the Intermolecular Hydroamination of Vinylarenes, Dienes, and Alkynes
作者:Christine Brinkmann、Anthony G. M. Barrett、Michael S. Hill、Panayiotis A. Procopiou
DOI:10.1021/ja209135t
日期:2012.2.1
nucleophilicity. Hydroamination of conjugated dienes yielded isomeric products via η(3)-allyl intermediates and their relative distributions were explained through stereoelectronic considerations. The ability to carry out the hydroamination of internal alkynes was found to be dramatically dependent upon the identity of the alkyne substituents while reactions employing terminal alkynes resulted in the
较重的第 2 族络合物 [MN(SiMe(3))(2)}(2)](2)(1, M = Ca; 2, M = Sr) 和 [MCH(SiMe(3)) (2)}(2)(THF)(2)] (3, M = Ca; 4, M = Sr) 被证明是温和条件下乙烯基芳烃和二烯分子间加氢胺化的有效预催化剂。初步研究表明,酰胺预催化剂 1 和 2 虽然在绝对活性方面受到氨基转移行为的影响,但对聚合/低聚副反应具有更高的稳定性。在每种情况下,锶物质 2 和 4 都被发现优于它们的钙同类物。哌啶与对位取代苯乙烯的反应表明催化循环中烯烃插入的速率决定性,而环仲胺的添加容易程度被发现取决于环的大小,并被认为是不同胺亲核性的结果。共轭二烯的加氢胺化通过 η(3)-烯丙基中间体产生异构产物,并通过立体电子考虑解释了它们的相对分布。发现进行内部炔烃的加氢胺化的能力极大地取决于炔烃取代基的身份,而使用末端炔烃的反应导致不溶性和非反应性第
Voigtlaender, Pharmazie, 1959, vol. 14, p. 318,319
作者:Voigtlaender
DOI:——
日期:——
Marini-Bettolo et al., Gazzetta Chimica Italiana, 1950, vol. 80, p. 281,292,296