General Asymmetric Synthesis of Densely Functionalized Pyrrolidines via <i>Endo</i>-Selective [3+2] Cycloaddition of β-Quaternary-Substituted Nitroalkenes and Azomethine Ylides
作者:Stephen N. Greszler、Gang Zhao、Marek Buchman、Xenia B. Searle、Bo Liu、Eric A. Voight
DOI:10.1021/acs.joc.0c00820
日期:2020.6.5
5-tetrasubstituted pyrrolidines via cycloaddition of nitroalkenes and azomethineylides is reported using a P,N-type ferrocenyl ligand and [Cu(OTf)]2·C6H6. The robust method is tolerant of a wide range of functionalities, including rarely reported quaternary nitroalkene substitution and heteroaromatic and hindered ortho-substituted arenes on the azomethineylide. Subsequent transformations highlight
一种可分级内的通过硝基烯烃和甲亚胺叶立德的环加成2,3,4,5-四取代的吡咯烷-选择性合成是使用P,N型二茂铁基配体报告和[铜(OTF)] 2 ·C 6 H ^ 6。稳健的方法可耐受多种功能,包括很少报道的季硝基链烯取代以及在甲亚胺叶立德上的杂芳族和受阻邻位取代的芳烃。随后的转化突出了该方法在合成适合基于片段的药物发现和囊性纤维化C2校正临床候选ABBV-3221的密集功能化小分子中的实用性。
Three-Component, Diastereoselective [6 + 3] Annulation of Tropone, Imino Esters, and Arynes
作者:Avishek Guin、Rahul N. Gaykar、Shiksha Deswal、Akkattu T. Biju
DOI:10.1021/acs.orglett.1c02662
日期:2021.10.1
diastereoselective [6 + 3] annulation reaction employing tropone, imino esters, and arynes allowing the synthesis of bridged azabicyclo[4.3.1]decadienes is demonstrated. The key nitrogen ylides for the [6 + 3] annulation were generated by the addition of imino esters to the arynes followed by a proton transfer. The nitrogen ylides undergo a regioselective addition to tropone to furnish the desired products in moderate
In this paper, an asymmetricallylicalkylation of easily available azomethine ylides with Morita–Baylis–Hillman (MBH) carbonates through a copper (I)/Lewisbase cooperative catalysis strategy has been realized. The co-catalyzed asymmetricallylicalkylation provided the corresponding amino acid derivatives in up to 90% yields with up to 99% ee as well as good to excellent regioselectivity.
在本文中,通过铜(I)/刘易斯碱协同催化策略实现了易于获得的偶氮甲碱叶立德与 Morita-Baylis-Hillman(MBH)碳酸酯的不对称烯丙基烷基化。共催化的不对称烯丙基烷基化以高达 90% 的产率和高达 99% 的 ee 以及良好至极好的区域选择性提供了相应的氨基酸衍生物。
PROCESS FOR PRODUCTION OF MONO-SUBSTITUTED ALKYLATED COMPOUND USING ALDIMINE OR DERIVATIVE THEREOF
申请人:Maruoka Keiji
公开号:US20090054679A1
公开(公告)日:2009-02-26
The present invention provides a method for producing asymmetrical mono-substituted alkylated compounds of α-amino acids that are represented by a specific formula, using an aldimine-type Schiff base. In the method of the present invention, the process of alkylating an aldimine-type Schiff base in a medium in the presence of an optically-active quaternary ammonium salt phase-transfer catalyst and an inorganic base is initiated, and subsequently the reaction is quenched at a time earlier than a time for completion of the stoichiometric reaction of the alkylation reaction, so that a mono-substituted alkylated product with high optical purity can be obtained.
Discovery and SAR of 4-aminopyrrolidine-2-carboxylic acid correctors of CFTR for the treatment of cystic fibrosis
作者:Marc J.C. Scanio、Xenia B. Searle、Bo Liu、John R. Koenig、Robert J. Altenbach、Gregory A. Gfesser、Andrew Bogdan、Stephen Greszler、Gang Zhao、Ashvani Singh、Yihong Fan、Andrew M. Swensen、Timothy Vortherms、Arlene Manelli、Corina Balut、Wenqing Gao、Hong Yong、Michael Schrimpf、Chris Tse、Philip Kym、Xueqing Wang
DOI:10.1016/j.bmcl.2022.128843
日期:2022.9
Cysticfibrosis (CF) is an autosomal recessive disease resulting from mutations on both copies of the CFTR gene. Phenylalanine deletion at position 508 of the CFTR protein (F508del-CFTR) is the most frequent mutation in CF patients. Currently, the most effective treatments of CF use a dual or triple combination of CFTR correctors and potentiators. In triple therapy, two correctors (C1 and C2) and a