The oxidation of 3-R-1,5-dihydro-2,4-benzothiepines with m-chloroperbenzoic acid occurs in a highly diastereoselective fashion. The resulting trans-sulfoxides at -60 degreesC in CDCl3 exist as an equilibrium mixture of the chair and boat forms with the substituents in the equatorial position. The fraction of the boat conformation increases in the series R = Ph, Me, t-Bu.
Montmorillonite KSF, a Mild and Efficient Catalyst for Benzodithiepination of Carbonyl Compounds
摘要:
A mild and efficient procedure for the protection of carbonyl compounds as 1,5-dihydro-3H-2,4-benzodithiepines in high yields is described by using a readily available and inexpensive KSF clay catalyst.
A Mild and Efficient Method for the Protection of Carbonyl Compounds as 1,5-Dihydro-2,4-benzodithiepines Using Anhydrous Iron(III) Chloride Dispersed on Silica Gel
作者:Harish K. Patney
DOI:10.1080/00397919308011283
日期:1993.7
Abstract A mild and efficient procedure for the protection of carbonylcompounds as 1,5-dihydro-2,4-benzodithiepines rapidly and in high yields is described by using 1,2-benzenedimethanethiol and anhydrous iron (III) chloride dispersed on silicagel as a catalyst.