Palladium-catalyzed dicyanative [4 + 2] cycloaddition using various ene−enynes was investigated. The key species in this process is a cyanoallene intermediate that is obtained by the cyanopalladation of conjugated enynes followed by 5-exo-cyclization. To achieve an efficient [4 + 2] cycloaddition reaction, both the smooth generation of this species and critical control of regioselectivity in the 6-endo-cyclization
[EN] BENZYLBENZENE DERIVATIVES AND METHODS OF USE<br/>[FR] DÉRIVÉS DE BENZYLBENZÈNE ET PROCÉDÉS D'UTILISATION
申请人:THERACOS INC
公开号:WO2009026537A1
公开(公告)日:2009-02-26
Provided are compounds having an inhibitory effect on sodium-dependent glucose cotransporter SGLT. The invention also provides pharmaceutical compositions, methods of preparing the compounds, synthetic intermediates, and methods of using the compounds, independently or in combination with other therapeutic agents, for treating diseases and conditions which are affected by SGLT inhibition.
Dramatic Effect of γ-Heteroatom Dienolate Substituents on Counterion Assisted Asymmetric Anionic Amino-Cope Reaction Cascades
作者:Pradipta Das、Michael D. Delost、Munaum H. Qureshi、Jianhua Bao、Jason S. Fell、Kendall N. Houk、Jon T. Njardarson
DOI:10.1021/jacs.1c00745
日期:2021.4.21
appear to proceed via the same pathway as the fluoride albeit with the added twist of a 3-exo-trig cyclization to yield chiral cyclopropane products with three stereocenters. When this same class of nucleophiles is substituted with a γ-nitro group, the Mannich-initiated cascade is now diverted to a β-lactam product instead of the amino-Cope pathway. These anionic asymmetric cascades are solvent- and counterion-dependent
Radical Borylative Cyclization of 1,6-Dienes: Synthesis of Boron-Substituted Six-Membered Heterocycles and Carbocycles
作者:Jing Qi、Feng-Lian Zhang、Yun-Shuai Huang、Ai-Qing Xu、Shi-Chao Ren、Zhen-Yu Yi、Yi-Feng Wang
DOI:10.1021/acs.orglett.8b00694
日期:2018.4.20
A radical borylative cyclization reaction of 1,6-dienes was developed to assemble boron-handled six-membered heterocycles and carbocycles. This reaction was initiated by the chemo- and regio-controlled addition of an N-heterocyclic carbene–boryl radical to one of the alkene tethers, followed by an intramolecular 6-exo cyclization to afford a six-membered ring framework. The utility of this method was
Cationic Rh(I) Catalyst in Fluorinated Alcohol: Mild Intramolecular Cycloaddition Reactions of Ester-Tethered Unsaturated Compounds
作者:Akio Saito、Takamitsu Ono、Yuji Hanzawa
DOI:10.1021/jo060827x
日期:2006.8.1
In fluorinatedalcohols, the cationic Rh(I) species, which is derived from [Rh(COD)Cl]2 and AgSbF6, efficiently catalyzed intramolecular [4+2] cycloaddition reactions of ester-tethered 1,3-diene-8-yne derivatives. The catalytic system was also effective in intramolecular [5+2] cycloaddition reactions of ester-tethered ω-alkynyl vinylcyclopropane compounds.