A general and efficient approach to 2H-indazoles and 1H-pyrazoles through copper-catalyzed intramolecular N–N bond formation under mild conditions
作者:Jiantao Hu、Yongfeng Cheng、Yiqing Yang、Yu Rao
DOI:10.1039/c1cc13908h
日期:——
A new efficient copper-catalyzed intramolecular amination reaction has been developed to readily synthesise a wide variety of multi-substituted 2H-indazole and 1H-pyrazole derivatives from easily accessible starting materials under mild conditions. A highly selective ligand for estrogen receptor β was prepared in three steps by employing this method.
Tyrphostins. 5. Potent Inhibitors of Platelet-Derived Growth Factor Receptor Tyrosine Kinase: Structure−Activity Relationships in Quinoxalines, Quinolines, and Indole Tyrphostins
作者:Aviv Gazit、Harald App、Gerald McMahon、Jefferey Chen、Alexander Levitzki、Frank D. Bohmer
DOI:10.1021/jm950727b
日期:1996.1.1
3-arylquinoxalines were prepared and tested for inhibition of platelet-derivedgrowthfactorreceptortyrosinekinase (PDGF-RTK) activity. The potency of the inhibitors was found to be quinoxalines > quinolines > indoles. Lipophilic groups (methyl, methoxy) in the 6 and 7 positions and phenyl at the 3 position of quinoxalines and quinolines were essential for potency, in contrast to the hydrophilic catechol
Titanacyclobutenes or Titanium Vinyl Carbene Complexes? Reactivity of Organotitanium Species Generated by the Reaction of γ-Chloroallyl Sulfides with a Titanocene(II) Reagent
conjugated dienes and vinyl cyclopropanes as major products, thus suggesting the formation of vinyl carbene complexes as intermediates. On the contrary, the organotitanium species generated from acyclic beta,gamma-disubstituted gamma-chloroallyl sulfides revealed titanacyclobutene-like reactivity, and their reaction with 1,5-diphenylpentan-3-one produced homoallyl alcohols. These organotitanium species
A three-component reaction for rapid access to underexplored 1,3-thiazine-2-thiones
作者:Denis Kröger、Fabian Brockmeyer、Christoph Kahrs
DOI:10.1039/c5ob00377f
日期:——
A newly developed multicomponent reaction opens access to a variety of (poly)heterocyclic structures containing the underexplored skeleton of 1,3-thiazine-2-thione.
Multicomponent reaction for the first synthesis of 2,2-dialkyl- and 2-alkyl-2-aralkyl-5,6-diaryl-2H-1,3-thiazines as scaffolds for various 3,4-dihydro-2H-1,3-thiazine derivatives
2H-1,3-thiazines, prepared via a novel and efficient multicomponent reaction, can be used as scaffolds for the synthesis of diverse 3,4-dihydro-2H-1,3-thiazines.