Transfer of Chirality by the Use of an All Carbon Tether
摘要:
Methylketone side chains can be used to direct the creation atone or more chiral centers, including quaternary centers, by exploiting the ability of the radical xanthate transfer process to mediate six-membered ring formation.
The present invention relates to processes for preparing certain 2-pyridones and 2-pyridinols, to novel compounds of these two types and to their use as biologically active compounds, in particular for controlling harmful microorganisms in crop protection, in the medicinal field and in the protection of materials.
Synthesis of endoperoxides by domino reactions of ketones and molecular oxygen
作者:L. Novkovic、M. Trmcic、M. Rodic、F. Bihelovic、M. Zlatar、R. Matovic、R. N. Saicic
DOI:10.1039/c5ra13476e
日期:——
Domino reactions of ketones with molecularoxygen in the presence of potassium hydroxide and potassium t-butoxide afford cyclic hydroperoxy acetals (3,5-dihydroxy-1,2-dioxanes). Mixed endoperoxides can also be obtained in a three-component reaction of two ketones and oxygen.
[EN] AMINOPYRIMIDINES AS SYK INHIBITORS<br/>[FR] AMINOPYRIMIDINES EN TANT QU'INHIBITEURS DE SYK
申请人:MERCK SHARP & DOHME
公开号:WO2012154519A1
公开(公告)日:2012-11-15
The present invention provides novel pyrimidine amines of formula I which are potent inhibitors of spleen tyrosine kinase, and are useful in the treatment and prevention of diseases mediated by said enzyme, such as asthma, COPD, rheumatoid arthritis and cancer.
(2+1)-Cycloaddition Reactions Give Further Evidence of the Nitrenium-like Character of 1-Aza-2-azoniaallene Salts
作者:Nezar Al-Bataineh、K. N. Houk、Matthias Brewer、Xin Hong
DOI:10.1021/acs.joc.7b00407
日期:2017.4.7
1-aza-2-azoniaallene salts react with structurally constrained alkenes in intramolecularreactions by C–H insertion at the allylic position, or by (2+1)-cycloaddition with the alkene followed by ring opening. The latter reaction gives further evidence of the nitrenium-like character of 1-aza-2-azoniaallene salts. DFT calculations show that alkeneaddition is intrinsically more favorable, but that predistortion
Mechanism and Dynamics of Intramolecular C–H Insertion Reactions of 1-Aza-2-azoniaallene Salts
作者:Xin Hong、Daniel A. Bercovici、Zhongyue Yang、Nezar Al-Bataineh、Ramya Srinivasan、Ram C. Dhakal、K. N. Houk、Matthias Brewer
DOI:10.1021/jacs.5b04474
日期:2015.7.22
Lewis acids, undergo intramolecularC-H amination reactions to form pyrazolines in good to excellent yields. This intramolecular amination occurs readily at both benzylic and tertiary aliphatic positions and proceeds at an enantioenriched chiral center with retention of stereochemistry. Competition experiments show that insertion occurs more readily at an electron-rich benzylic position than it does