Graphene Oxide: A Metal‐Free Carbocatalyst for the Synthesis of Diverse Amides under Solvent‐Free Conditions
作者:Khushbu P. Patel、Eknath M. Gayakwad、Vilas V. Patil、Ganapati S. Shankarling
DOI:10.1002/adsc.201801673
日期:2019.4.23
solvent‐free reaction conditions providing desired products in good to excellent yields. The one‐pot synthesis of 2,3‐Dihydro‐5H‐benzo[b]‐1,4‐thiazepin‐4‐one moiety by GO catalyzed Aza Michael addition followed by intramolecular transamidation is also described. A plausible reaction mechanistic pathway involving H‐bonding is discussed. The graphene oxide can be recycled and reused up to five cycles without
Some 1, 5-dihydro-5-deazaflavin (1, 5-dihydropyrimido [4, 5-b] quinoline-2, 4 (3H, 10H) -dione) derivatives possessing chiral substituents at the N-3 position were synthesized. Asymmetric reduction of ethyl benzoylformate in the presence of magnesium perchlorate was carried out with these chiral 1, 5-dihydro-5-deazaflavin derivatives to give ethyl mandelate in moderate optical and chemical yield. The influence of metal additives other than magnesium upon the asymmetric induction and yield of the reduction was investigated, and it was suggested that intermediate ternary complexation is probably involved in the reaction. No improvement of chiral induction was obtained by changing the metal catalyst.
[EN] QUINOXALINONE-3- ONE DERIVATIVES AS OREXIN RECEPTOR ANTAGONISTS<br/>[FR] DERIVES DE QUINOXALINONE-3- ONE UTILISES COMME ANTAGONISTES DU RECEPTEUR D'OREXINE
申请人:ACTELION PHARMACEUTICALS LTD
公开号:WO2004096780A1
公开(公告)日:2004-11-11
The invention relates to quinoxalinone derivatives of general Formula (I) and their use as active ingredients in the preparation of pharmaceutical compositions. The invention also concerns related aspects including processes for the preparation of the compounds, pharmaceutical compositions containing one or more of those compounds and especially their use as orexin receptor antagonists.General Formula (I) wherein X and R1-R9 are as defined in the description
[EN] 7,8,9,10-TETRAHYDRO-6H-AZEPINO, 6,7,8,9-TETRAHYDRO-PYRIDO AND 2,3-DIHYDRO-2H-PYRROLO[2,1-B]-QUINAZOLINONE DERIVATIVES<br/>[FR] DERIVES DE 7,8,9,10-TETRAHYDRO-6H-AZEPINO, 6,7,8,9-TETRAHYDRO-PYRIDO ET 2,3-DIHYDRO-2H-PYRROLO[2,1-B]-QUINAZOLINONE
申请人:ACTELION PHARMACEUTICALS LTD
公开号:WO2004004733A1
公开(公告)日:2004-01-15
The invention relates to novel 7,8,9,10-tetrahydro-6H-azepino, 6,7,8,9-tetrahydro-pyrido and 2,3-dihydro-2H-pyrrolo[2,1-b]-quinazolinone derivatives of formula (I) and their use as active ingredients in the preparation of pharmaceutical compositions. The invention also concerns related aspects including processes for the preparation of the compounds, pharmaceutical compositions containing one or more of those compounds and especially their use as orexin receptor antagonists.
Synthesis of Trifluoromethylated Analogues of 4,5-Dihydroorotic Acid
作者:Volodymyr A. Sukach、Anastasia A. Resetnic、Viktor M. Tkachuk、Zhengguo Lin、Ulrich Kortz、Mykhailo V. Vovk、Gerd-Volker Röschenthaler
DOI:10.1002/ejoc.201403495
日期:2015.2
4-(Trifluoromethyl)pyrimidin-2(1H)-ones react with trimethylsilyl cyanide in the presence of a tertiary amine catalyst to give Michael-like 1,4-conjugate hydrocyanation adducts exclusively at the 3,6-positions. The resulting 2-oxo-6-(trifluoromethyl)-1,2,3,4-tetrahydropyrimidine-4-carbonitriles have been used to synthesize new trifluoromethylated 4,5-dihydroorotic acid analogues and their esters in