Organocatalytic Enantioselective γ-Aminoalkylation of Unsaturated Ester: Access to Pipecolic Acid Derivatives
摘要:
The direct gamma-carbon functionalization of alpha,beta-unsaturated esters via N-Heterocyclic Carbene (NHC) catalysis is disclosed. This catalytically generated nucleophilic gamma-carbon undergoes highly enantioselective additions to hydrazones. The resulting delta-lactam products can be readily transformed to optically enriched pipecolic acid derivatives.
Synergistic <i>N</i>-Heterocyclic Carbene/Palladium-Catalyzed [3 + 2] Annulation of Vinyl Enolates with 1-Tosyl-2-vinylaziridine
作者:Jian Gao、Jianming Zhang、Shuaishuai Fang、Jie Feng、Tao Lu、Ding Du
DOI:10.1021/acs.orglett.0c02935
日期:2020.10.2
(E)-3-ethylidene-4-vinylpyrrolidin-2-ones in a regioselective and stereoselective manner. The preliminary asymmetric studies were also performed, which indicated a potential for enantioselective annulation of vinyl enolate intermediates with transition-metal−π-allyl species.
Pd-catalyzed α-olefinic C-H activation of simple α,β-unsaturated olefins has been developed. 4-imino-β-lactam derivatives were readily synthesized via activation of α-olefinic C-H bonds with excellent cis stereoselectivity. A wide range of heterocycles at the β-position are compatible with this reaction. The product of 4-imino-β-lactam derivatives can be readily converted to 2-aminoquinoline which
Construction of Multi-Substituted Benzenes via NHC-Catalyzed Reactions of Carboxylic Esters
作者:Jichang Wu、Chengli Mou、Yonggui Robin Chi
DOI:10.1002/cjoc.201700773
日期:2018.4
A carbene‐catalyzed ester activation reaction for the synthesis of multi‐substituted benzenes is developed. Tetra‐substituted benzene compounds are efficiently synthesized through this methodology. Compared with aldehyde substrates used in previous reports, the ester substrates used here are much more readily available and inexpensive. In addition, the TEMPO oxidant used here is more inexpensive than
Furopyridine sulfonamides and their opthalmological compositions
申请人:Merck & Co., Inc.
公开号:US04808595A1
公开(公告)日:1989-02-28
Furopyridine sulfonamides are carbonic anhydrase inhibitors useful in the treatment of elevated intraocular pressure and disorders associated therewith such as glaucoma.
Furopyridine磺酰胺是一种碳酸酐酶抑制剂,可用于治疗眼内压升高及其相关的疾病,如青光眼。
Organocatalytic Enantioselective γ-Aminoalkylation of Unsaturated Ester: Access to Pipecolic Acid Derivatives
作者:Jianfeng Xu、Zhichao Jin、Yonggui Robin Chi
DOI:10.1021/ol402358k
日期:2013.10.4
The direct gamma-carbon functionalization of alpha,beta-unsaturated esters via N-Heterocyclic Carbene (NHC) catalysis is disclosed. This catalytically generated nucleophilic gamma-carbon undergoes highly enantioselective additions to hydrazones. The resulting delta-lactam products can be readily transformed to optically enriched pipecolic acid derivatives.