Catalytic Selective Metal-Free Cross-Coupling of Heteroaromatic <i>N</i>-Oxides with Organosilanes
作者:Mahesh Puthanveedu、Vasiliki Polychronidou、Andrey P. Antonchick
DOI:10.1021/acs.orglett.9b01141
日期:2019.5.3
of heteroaromatic N-oxides has been developed. The method enables the synthesis of various benzylated and alkynylated N-heterocycles in a transition-metal-free manner employing organosilanes as coupling partners. The unanticipated reactivity has been exploited for the synthesis of a number of symmetrical disubstitutedacetylenes from ethynyltrimethylsilane via carbon–silicon bond metathesis.
Manganese‐Catalyzed Asymmetric Hydrogenation of Quinolines Enabled by π–π Interaction**
作者:Chenguang Liu、Mingyang Wang、Shihan Liu、Yujie Wang、Yong Peng、Yu Lan、Qiang Liu
DOI:10.1002/anie.202013540
日期:2021.3
The non‐noble metal‐catalyzed asymmetric hydrogenation of N‐heteroaromatics, quinolines, is reported. A new chiral pincer manganese catalyst showed outstanding catalytic activity in the asymmetric hydrogenation of quinolines, affording high yields and enantioselectivities (up to 97 % ee). A turnover number of 3840 was reached at a low catalyst loading (S/C=4000), which is competitive with the activity
报道了非贵金属催化的N-杂芳族化合物喹啉的不对称氢化。一种新型手性钳式锰催化剂在喹啉的不对称氢化中表现出出色的催化活性,提供了高收率和对映选择性(高达97%ee)。在低催化剂负载量(S / C = 4000)下,达到了3840的周转率,与该反应中最有效的贵金属催化剂的活性相竞争。对映选择性的精确调节通过π-π相互作用来保证。
Synthesis of 2-Substituted Quinolines <i>via</i>
Rhodium(III)-Catalyzed C-H Activation of Imidamides and Coupling with Cyclopropanols
作者:Xukai Zhou、Zisong Qi、Songjie Yu、Lingheng Kong、Yang Li、Wan-Fa Tian、Xingwei Li
DOI:10.1002/adsc.201601278
日期:2017.5.17
An efficient synthesis of 2-substituted quinolines from readily available cyclopropanols and imidamides has been developed, where the cyclopropanol acts as a C3 synthon. With the assistance of a bifunctional imidamide directing group, the reaction occurred via sequential C–H/C–C cleavage and C–C/C–N bond formation.