A mild,efficient and regioselective method for the mononitration of phenolic compounds is described using bismuth subnitrate/ charcoal in the presence of trichloroisocyanuric acid in CH2Cl2 at room temperature.
The linear hexapeptide(His-Gly-Asp) was synthesized on solid support.FM group was used for a carboxyl protection group at Aspl.Peptide was cyclizsed by BOP reagent while still attached to the solid support.BOP proceed...The linear hexapeptide(His-Gly-Asp) was synthesized on solid support.FM group was used for a carboxyl protection group at Aspl.Peptide was cyclizsed by BOP reagent while still attached to the solid support.BOP proceeded more rapidly and gave purer product than DCC/HOBt method.展开更多
Hydrogen peroxide was supported on polyvinylpyrrolidone to afford a stable and mild oxidizing reagent. Activated aromatic compounds were reacted with PVP-H2O2 in the presence of KI or I2 and a catalytic amount of H3PW...Hydrogen peroxide was supported on polyvinylpyrrolidone to afford a stable and mild oxidizing reagent. Activated aromatic compounds were reacted with PVP-H2O2 in the presence of KI or I2 and a catalytic amount of H3PW12O40 in refluxing CH2Cl2 to afford the corresponding iodinated arenes.展开更多
A new polymer-supported reagent--poly{[4-hydroxy(tosyloxy)iodo]styrene} has good reactivity in the formation of 2-amino-4-arylthiazoles, and the procedure of regeneration and cycle are also described.
基金Financial support by DUBS Research Council is gratefully acknowledged
文摘A mild,efficient and regioselective method for the mononitration of phenolic compounds is described using bismuth subnitrate/ charcoal in the presence of trichloroisocyanuric acid in CH2Cl2 at room temperature.
文摘The linear hexapeptide(His-Gly-Asp) was synthesized on solid support.FM group was used for a carboxyl protection group at Aspl.Peptide was cyclizsed by BOP reagent while still attached to the solid support.BOP proceeded more rapidly and gave purer product than DCC/HOBt method.
文摘Hydrogen peroxide was supported on polyvinylpyrrolidone to afford a stable and mild oxidizing reagent. Activated aromatic compounds were reacted with PVP-H2O2 in the presence of KI or I2 and a catalytic amount of H3PW12O40 in refluxing CH2Cl2 to afford the corresponding iodinated arenes.
文摘A new polymer-supported reagent--poly{[4-hydroxy(tosyloxy)iodo]styrene} has good reactivity in the formation of 2-amino-4-arylthiazoles, and the procedure of regeneration and cycle are also described.
