Cobalt-Catalyzed Selective Synthesis of Isoquinolines Using Picolinamide as a Traceless Directing Group
作者:Changsheng Kuai、Lianhui Wang、Bobin Li、Zhenhui Yang、Xiuling Cui
DOI:10.1021/acs.orglett.7b00702
日期:2017.4.21
first been employed as a traceless directing group for the cobalt-catalyzed oxidative annulation of benzylamides with alkynes to synthesize isoquinolines throughC–H/N–H bonds activation. Oxygen is used as a terminal oxidant. This protocol exhibits good functional group tolerance and excellent regioselectivity. Both terminal and internalalkynes can be efficiently applied to this catalytic system as substrates
[Cp*Rh<sup>III</sup>
] in an Ionic Liquid as a Highly Efficient and Recyclable Catalytic Medium for Regio- and Diastereoselective Csp<sup>3</sup>
-H Carbenoid Insertion
A bidentate‐assisted Csp3–H bond insertion using Cp*RhIII/IL as a highlyefficient and recyclable catalytic medium is reported. The application of ionicliquid not only lowered the temperature, but also enhanced the diastereoselectivity of this reaction. This work significantly expanded the scope of ionicliquids in Csp3–H functionalizations
据报道,使用Cp * Rh III / IL作为高效且可回收的催化介质,可进行双齿辅助的Csp 3 -H键插入。离子液体的应用不仅降低了温度,而且提高了该反应的非对映选择性。这项工作大大扩展了Csp 3 -H官能化中离子液体的范围
Cobalt-Catalyzed<i>ortho</i>-C−H Functionalization/Alkyne Annulation of Benzylamine Derivatives: Access to Dihydroisoquinolines
作者:Ángel Manu Martínez、Nuria Rodríguez、Ramón Gómez-Arrayás、Juan C. Carretero
DOI:10.1002/chem.201702283
日期:2017.8.25
A practical picolinamide-directed C−H functionalization/alkyne annulation of benzylaminederivatives enabling access to the previously elusive 1,4-dihydroisoquinoline skeleton was developed using molecular O2 as the sole oxidant and Co(OAc)2 as precatalyst. The method is compatible with both internal and terminal alkynes and shows high versatility and functional-group tolerance. Furthermore, full preservation
An efficient Ir(III)-catalyzed straightforward intermolecular N-arylation of acyclic aliphatic amides has been achieved using quinone diazide as a coupling partner. The reaction has been developed under simple and mild reaction conditions with a broad substrate scope. The bidentate picolinamide group is essential for successful transformation. Mechanistic studies and DFT calculations highlighted the
Traceless Directing Group Assisted Cobalt-Catalyzed C−H Carbonylation of Benzylamines
作者:Fei Ling、Chongren Ai、Yaping Lv、Weihui Zhong
DOI:10.1002/adsc.201700780
日期:2017.11.10
The first example of cobalt‐catalyzed C(sp2)−H carbonylation of benzylamines using a traceless directing group is reported, which was successfully applied to the synthesis of N−unprotected iso‐indolinones through direct C−H/N−H bonds activation. This protocol tolerates a variety of functional groups and provides a facile and efficient method for the formal synthesis of (+)‐garenoxacin.
报道了使用无痕导向基团的钴催化苄胺的C(sp 2)-H羰基羰基化的第一个实例,该实例已成功地用于通过直接CH / H / NH键活化而合成N-未保护的异吲哚啉酮。该方案可耐受多种官能团,并为(+)-加仑沙星的正式合成提供了一种简便而有效的方法。