[EN] TETRAZOLE COMPOUNDS AND THEIR USE AS METABOTROPIC GLUTAMATE RECEPTOR ANTAGONITS [FR] COMPOSES DE TETRAZOLE ET LEUR UTILISATION COMME ANTAGONISTES DE RECEPTEURS DE GLUTAMATE METABOTROPIQUES
A formal [4 + 2] cycloaddition of N-tosylhydrazones with ortho-quinone methides was developed, affording the facile synthesis of diverse 1,3-oxazine derivatives under mild conditions. In this transformation, N-tosylhydrazones are used as a 1,2-dipole synthon under base-free conditions. Moreover, the substrate scope is broad, and the products are formed with high diastereoselectivities in most of the
Effective and Highly Stereoselective Coupling with Vinyldiazomethanes To Form Symmetrical Trienes
作者:Michael P. Doyle、Ming Yan
DOI:10.1021/jo016135k
日期:2002.1.1
Diazo coupling reactions are capable of forming E,E,E-trienes from cinnamaldehydes in good yield. An efficient methodology is reported for the production of styryldiazomethanes that are subsequently used with catalysis for coupling and for cyclopropanation. A vast difference in product selectivity is seen with styryldiazomethane generated from the corresponding hydrazone via manganese dioxide oxidation
Ruthenium(II) porphyrin catalyzed cyclopropanation of alkenes with tosylhydrazones
作者:Jun-Long Zhang、Philip Wai Hong Chan、Chi-Ming Che
DOI:10.1016/j.tetlet.2003.09.157
日期:2003.11
The diastereoselective ruthenium(II) porphyrincatalyzed cyclopropanation of a variety of alkenes with aryl diazomethanes generated in situ from stable tosylhydrazone derivatives, was achieved in good to excellent yields (up to 92%) and product turnovers. The practical utility of [RuII(p-Cl-TPP)(CO)] (H2(p-Cl-TPP)=meso-tetrakis(p-chlorophenyl)porphyrin) 3 was illustrated in the synthesis of the potent
Palladium-catalyzed three-component reaction of N-tosylhydrazone, norbornene and aryl halide
作者:Fangdong Hu、Ying Xia、Zhenxing Liu、Chen Ma、Yan Zhang、Jianbo Wang
DOI:10.1039/c4ob00590b
日期:——
A palladium-catalyzedthree-component reaction of N-tosylhydrazone, norbornene and arylhalide has been demonstrated. In this reaction, an intermolecular Heck-type reaction occurs, which is followed by the alkyl palladium carbene migratory insertion process. This transformation provides an efficient and convenient methodology for the double functionalization of norbornene with good to excellent yields
Isoindolines are synthesized by palladium-catalyzed coupling reaction of N-(2-iodobenzyl) anilines with α,β-unsaturated N-tosylhydrazones. The reaction has several potential advantages: (1) toleration of a wide range of functional groups, (2) easy to handle and with mild conditions, (3) enriches the isoindoline family, (4) two new bonds form in one step.