A novel pyridinium salt-supported [hydroxy(tosyloxy)iodo]benzene (HTIB) reagent (N-4-[hydroxy(tosyloxy)iodo]phenyl}pyridinium hexafluorophosphate) was prepared via Zincke’s reaction. The conjugate...
A novel and convenient approach for tosyloxylation of aromatic ring of some ortho-substituted phenolic compounds using [hydroxy(tosyloxy)iodo]benzene
作者:Om Prakash、Manoj Kumar、Rajesh Kumar
DOI:10.1016/j.tet.2010.05.042
日期:2010.7
substituted monohydric phenols, containing electron-withdrawing substituents at the ortho position to the phenolic group, with [hydroxy(tosyloxy)iodo]benzene (HTIB, Koser’s reagent) leads to novel tosyloxylation of aromaticring, thereby offering a convenient synthesis of hitherto unknown 4-tosyloxy-2-substituted phenols.
Nitro-Group-Directed Selective Deacylation and Desulfonation
作者:Chunbao Li、Xiujie Ji
DOI:10.1055/s-2006-942451
日期:2006.8
Nitro-substituted phenolic esters and sulfonates were successfully and selectively deacylated and desulfonated, respectively. The directing effect of the nitro group is supported by the excellent regioselectivities and good yields. These reactions demonstrate for the first time that the complexation of AlCl3 with the phenolic nitro group is stronger than that with the phenolic ester or sulfonate group alone. The mechanism for the selective deacylation and desulfonation directed by the nitro group is proposed.