Dynamic Kinetic Asymmetric Cross-Benzoin Additions of β-Stereogenic α-Keto Esters
作者:C. Guy Goodman、Jeffrey S. Johnson
DOI:10.1021/ja508521a
日期:2014.10.22
The dynamickineticresolution of β-halo α-keto esters via an asymmetric cross-benzoin reaction is described. A chiral N-heterocycliccarbenecatalyzes the umpolung addition of aldehydes to racemic α-keto esters. The resulting fully substituted β-halo glycolic ester products are obtained with high levels of enantio- and diastereocontrol. The high chemoselectivity observed is a result of greater electrophilicity
A variety of oxazole derivatives that possess an alpha,beta-unsaturated substituent at the 2-position were conveniently synthesized in good yields via a Hantzsch-type reaction between dehydroamino acid amides and P-bromopyruvate derivatives. Furthermore, oxazoles with substituents at the 2- and 5-positions were also obtained in good yields using the corresponding beta-substituted beta-bromopyruvate derivatives. A revised reaction mechanism to explain the enhanced reactivity of dehydroamino acid amides for the Hantzsch-oxazole-type reaction is presented.
Juy,M. et al., Comptes Rendus des Seances de l'Academie des Sciences, Serie C: Sciences Chimiques, 1974, vol. 279, p. 469 - 472
作者:Juy,M. et al.
DOI:——
日期:——
[EN] IMIDAZO [1, 2-A] PYRIDINE SULFONAMIDES AS TRPM8 MODULATORS<br/>[FR] IMIDAZO[1,2-A]PYRIDINESULFONAMIDES EN TANT QUE MODULATEURS DE TRPM8
申请人:JANSSEN PHARMACEUTICA NV
公开号:WO2012078994A1
公开(公告)日:2012-06-14
Disclosed are compounds, compositions and methods for treating various diseases, syndromes, conditions and disorders, including pain. Such compounds are represented by Formula (I) as follows:wherein Y, R1, R2, and are defined herein.