Alkyne compounds with MCH antagonistic activity and medicaments comprising these compounds
申请人:Stenkamp Dirk
公开号:US20050245529A1
公开(公告)日:2005-11-03
Alkyne compounds of formula I
wherein A, B, W, X, Y, Z, R
1
, and R
2
have the meanings given herein, which have MCH-receptor antagonistic activity and are useful for preparing pharmaceutical compositions for the treatment of metabolic disorders and/or eating disorders, particularly obesity and diabetes.
Trifunctionalization of Cinnamyl Alcohols Provides Access to Brominated α,α-Difluoro-γ-lactones via a Photoinduced Radical–Polar–Radical Mechanism
作者:Roshan K. Dhungana、Albert Granados、Vittorio Ciccone、Robert T. Martin、Jadab Majhi、Mohammed Sharique、Osvaldo Gutierrez、Gary A. Molander
DOI:10.1021/acscatal.2c05514
日期:2022.12.16
A photochemical synthesis of brominated α,α-difluoro-γ-lactones from cinnamylalcohols and ethyl bromodifluoroacetate is reported via one-pot Giese addition/lactonization/halogen-atom transfer (XAT) processes. This transformation provides brominated α,α-difluoro-γ-lactones in moderate to good diastereoselectivities. The reaction affords a rapid increase in molecular complexity in organofluorine chemical
Enantioselective Sulfonium–Claisen Rearrangement with Cinnamyl Thioethers
作者:Jiwon Jang、Youngjin Bae、Seunghoon Shin
DOI:10.1021/acs.orglett.3c01244
日期:2023.6.2
Sulfonium–Claisen rearrangement leveraged by the gold-catalyzed formation of allyl sulfonium intermediates has enabled an exceptional level of regio- and enantiocontrol for the synthesis of skipped 1,4-dienes. However, the application of cinnamyl thioether derivatives to the sulfonium–Claisen rearrangement has been unsuccessful so far due to the extensive dissociation of the cinnamyl cation. By fine-tuning
developed, providing a convenient and efficient approach to enantioenriched trans-1,2-difunctionalized products. The key of the success is the development of a formal late-stage stereomutation strategy, which could enable chiral cis-isomers to be converted into trans-isomer, thus achieving high diastereocontrol.
Total synthesis of combretastatin D-2: intramolecular Ullmann macrocyclization reaction
作者:Dale L. Boger、Subas M. Sakya、Daniel Yohannes
DOI:10.1021/jo00013a024
日期:1991.6
The total synthesis of combretastatin D-2, a cytotoxic constituent of Combretum caffrum (Combretaceae), is detailed and is based on the implementation of a key intramolecular Ullmann macrocyclization reaction for formation of the cyclic 15-membered caffrane biaryl ether.