Fast and Efficient Synthesis of Pyrano[3,2-<i>c</i>]quinolines Catalyzed by Niobium(V) Chloride
作者:Mauricio Constantino、Luiz da Silva-Filho、Valdemar Lacerda Júnior、Gil da Silva
DOI:10.1055/s-2008-1067186
日期:2008.8
A highly efficient two-step method for the synthesis of pyranoquinoline derivatives from imino-Diels-Alder reactions between aldimines and 3,4-dihydro-2H-pyran using niobium(V) chloride as catalyst under mild conditions is described.
Synthesis of Benzhydryl-Substituted Amines by Silanolate-Mediated Aldimine Arylation with Functionalized Aryl Nucleophiles Released from Diazene-Based Reagents
作者:Aliyaah J. M. Rahman、Lucie Finck、Wolfgang Obermayer、Martin Oestreich
DOI:10.1021/acs.orglett.2c03798
日期:2022.12.16
imine derivatives with functionalized aryl pronucleophiles is reported. The aryl nucleophiles are released from silicon-protected aryl-substituted diazenes by desilylation with potassium trimethylsilanolate concomitant with the loss of dinitrogen. A broad range of functional groups is tolerated in the aryl nucleophile but, depending upon their electronic effect, require specific groups at the imine
[GRAPHICS]An environmentally benign and highly efficient procedure for the nucleophilic addition of trimethylsilyl cyanide to imines (Strecker reaction) has been developed under biomimetic conditions in water in the presence of beta-cyclodextrin to afford alpha-aminonitriles in quantitative yields. The use of cyclodextrin precludes the use of either acid or base, and the catalyst can be recycled a number of times without loss in activity.
High degree of exo selectivity in imino Diels-Alder reactions catalyzed by tert-butyldimethylsilyltriflate
作者:Denise Nogue、Renée Paugam、Lya Wartski
DOI:10.1016/s0040-4039(00)91597-1
日期:1992.3
Diels-Alder reactions of silyloxydiene 1 derived from 1-acetylcyclohexene with imines 2b and 2c occur with high exo selectivity depending upon experimental conditions: exo cycloadducts 3b-c are exclusively formed under kinetic control using tert-butyldimethylsilyltriflate as catalyst. In the presence of AlCl3, under thermodynamic control, high endo selectivity is only observed with 2b.