Rhodium(iii)-catalyzed C–H activation/[4+3] annulation of N-phenoxyacetamides and α,β-unsaturated aldehydes: an efficient route to 1,2-oxazepines at room temperature
cobalt(III)-catalyzed, redox-neutral, intermolecular carboamination of propiolates and bicyclic alkenes was developed. This non-annulative coupling strategy features atom economy, high regioselectivity, good yields, and functional groups tolerance. Such a carboamination reaction was applied to modified phenolsfrom the corresponding phenols under mild conditions.
High‐valent cyclopentadienyl cobalt catalysis is a versatile tool for sustainable C−H bond functionalizations. To harness the full potential of this strategy, control of the stereoselectivity of these processes is necessary. Herein, we report highly enantioselective intermolecular carboaminations of alkenes through C−H activation of N‐phenoxyamides catalyzed by CoIII‐complexes equipped with chiral
高价的环戊二烯基钴催化是实现可持续CH键功能化的通用工具。为了充分利用这种策略的潜力,必须控制这些过程的立体选择性。在本文中,我们报道了通过配备有手性环戊二烯基(Cp x)配体的Co III络合物催化的N苯氧酰胺的C H活化,对烯烃进行高度对映选择性的分子间碳胺化反应。该方法可在非常温和的条件下将广泛使用的丙烯酸酯以及双环烯烃转化为有吸引力的对映体富集的异酪氨酸衍生物,以及经过精制的氨基取代的双环支架。概述的反应性是Cp x Co III特有的 与4d和5d贵金属催化剂的反应性互补。
Rh(III)-Catalyzed Redox-Neutral Unsymmetrical C–H Alkylation and Amidation Reactions of <i>N</i>-Phenoxyacetamides
diazo compounds via a Rh(III)-catalyzed C-H activation, and the resulting Rh(III) intermediate subsequently undergoes an intramolecular oxidative addition into the O-N bond to form a Rh(V) nitrenoid species that is protonated and further directed toward electrophilic addition to the second ortho position of the phenyl ring. This work might provide a new direction for unsymmetrical C-H difunctionalization
Metal‐Free [3,3]‐Sigmatropic Rearrangement/[3+2] Annulation Cascade of
<i>N</i>
‐Phenoxy Amides with Terminal Alkynes for the Diastereoselective Synthesis of
<i>trans</i>
‐Dihydrobenzofurans
作者:Fu‐Xiaomin Liu、Weijie Chen、Guoxun Zhu、Zhi Zhou、Hui Gao、Wei Yi
DOI:10.1002/adsc.201900527
日期:2019.9.3
An efficient synthetic route for the diastereoselectiveconstruction of trans‐dihydrobenzofurans via cascade [3,3]‐sigmatropic rearrangement/[3+2] annulation sequences has been developed. This protocol represents a metal‐free transformation of the promising N‐phenoxy amides with terminal alkynes and features mild conditions, good functional group compatibility, and practical synthetic potential.
DIAMINOPYRIMIDINE DERIVATIVES AND PROCESSES FOR THE PREPARATION THEREOF
申请人:Lee Hyun-Joo
公开号:US20130338179A1
公开(公告)日:2013-12-19
The present invention provides a diaminopyrimidine derivative or its pharmaceutically acceptable salt, a process for the preparation thereof, a pharmaceutical composition comprising the same, and a use thereof. The diaminopyrimidine derivative or its pharmaceutically acceptable salt functions as a 5-HT
4
receptor agonist, and therefore can be usefully applied for preventing or treating dysfunction in gastrointestinal motility, one of the gastrointestinal diseases, such as gastroesophageal reflux disease (GERD), constipation, irritable bowel syndrome (IBS), dyspepsia, post-operative ileus, delayed gastric emptying, gastroparesis, intestinal pseudo-obstruction, drug-induced delayed transit, or diabetic gastric atony.