三取代烯烃的立体选择性合成是有机化学中长期存在的挑战,因为三取代烯烃的 E 和 Z 异构体之间的能量差异很小(与 1,2-二取代烯烃相比)。1,1-二取代烯烃的过渡金属催化异构化可以作为三取代烯烃的替代方法,但由于与反应效率和立体选择性有关的问题,它仍然不发达。在这里,我们展示了一种新型钴催化剂可以克服这些挑战,为获得广泛的三取代烯烃提供有效和立体选择性的途径。该协议与单烯和二烯兼容,并表现出良好的官能团耐受性和可扩展性。而且,它已被证明是构建有机发光体和氘代三取代烯烃的有用工具。对该机制的初步研究表明,该反应涉及钴氢化物途径。该反应的高立体选择性归因于 π-π 堆积效应和底物和催化剂之间的空间位阻。
三取代烯烃的立体选择性合成是有机化学中长期存在的挑战,因为三取代烯烃的 E 和 Z 异构体之间的能量差异很小(与 1,2-二取代烯烃相比)。1,1-二取代烯烃的过渡金属催化异构化可以作为三取代烯烃的替代方法,但由于与反应效率和立体选择性有关的问题,它仍然不发达。在这里,我们展示了一种新型钴催化剂可以克服这些挑战,为获得广泛的三取代烯烃提供有效和立体选择性的途径。该协议与单烯和二烯兼容,并表现出良好的官能团耐受性和可扩展性。而且,它已被证明是构建有机发光体和氘代三取代烯烃的有用工具。对该机制的初步研究表明,该反应涉及钴氢化物途径。该反应的高立体选择性归因于 π-π 堆积效应和底物和催化剂之间的空间位阻。
Iron-Catalyzed Highly Enantioselective Hydrogenation of Alkenes
作者:Peng Lu、Xiang Ren、Haofeng Xu、Dongpo Lu、Yufeng Sun、Zhan Lu
DOI:10.1021/jacs.1c04773
日期:2021.8.18
for the first time an iron-catalyzed highlyenantioselectivehydrogenation of minimally functionalized 1,1-disubstituted alkenes to accesschiral alkanes with full conversion and excellent ee. A novel chiral 8-oxazoline iminoquinoline ligand and its iron complex have been designed and synthesized. This protocol is operationally simple by using 1 atm of hydrogen gas and shows good functional group tolerance
A novel photoinduced intermolecular 1,2-arylheteroarylation of alkenes and the efficient synthesis of valuable polyarylalkanes are reported. The reaction is operationally simple, proceeds under mild conditions and with no additional catalyst and reagents. The strategically designed radical cascade reaction is enabled by electron transfer, and involves cleavage of an inert C-C bond. The process features broad functional group compatibility as well as high product transformability.
A metal-free, photoredox-catalyzed three-component cyanoalkylfluorination of alkenes under mild and redox-neutral conditions is reported. This protocol features use of readily available alkenes, oximeesters, and cost-effective nucleophilic fluoride reagents, giving diverse cyanoalkylfluorinated products with generally good yields. Excellent functional group tolerance and mild reaction conditions also
various alkenes with sulfonyl radical sources (RSO2NHNH2) and Et3N·3HF as cost-effective fluorination reagents under mild conditions. Remarkably, this protocol features very green and sustainable conditions obviating the need of chemical oxidants and transition metal catalyst. A variety of substituents on both sulfonyl hydrazides and alkenes are tolerated to give vicinal fluorinated sulfones in moderate
在此,我们报道了在温和条件下,使用磺酰基自由基源(RSO 2 NHNH 2)和 Et 3 N·3HF 作为具有成本效益的氟化试剂对各种烯烃进行实用且有效的氟磺酰化。值得注意的是,该协议具有非常绿色和可持续的条件,无需化学氧化剂和过渡金属催化剂。磺酰肼和烯烃上的各种取代基都可以耐受,从而以中等至优异的产率产生邻位氟化砜。此外,这种转化的合成效用通过克级反应和复杂分子的后期功能化得到进一步证明。
Indole, indazole and indoline derivatives as CETP inhibitors
申请人:Conte-Mayweg Aurelia
公开号:US20060030613A1
公开(公告)日:2006-02-09
The present invention relates to compounds of formula (I):
wherein —X—Y—, R
1
to R
11
and n are as defined in the description and claims, and pharmaceutically acceptable salts thereof. The compounds are useful for the treatment and/or prevention of diseases which are mediated by CETP inhibitors.