AN EFFICIENT SYNTHESIS OF 3,4-DIHYDRO-1H-2,3-BENZOTHIAZINE 2,2-DIOXIDES USING AMBERLYST 15 AND AMBERLYST XN 1010
作者:Rodolfo D. Bravo、Alicia S. Cánepa
DOI:10.1081/scc-120014987
日期:2002.1
ABSTRACT Resins Amberlyst 15 and Amberlyst XN 1010 are used in the synthesis of 3,4-dihydro-1H-2,3-benzothiazines 2,2-dioxide. Advantages of this new procedure are simple work-up, high yield and selectivity, easy recovery of the catalyst and no waste problems.
Sianesi,E. et al., Chemische Berichte, 1971, vol. 104, p. 1880 - 1891
作者:Sianesi,E. et al.
DOI:——
日期:——
Sulfated Zirconia as an Efficient Catalyst for Sulfonylamidomethylation of Benzylsulfonamides and 2-Phenylethanesulfonamides: Effect of Catalyst Thermal Treatment
作者:Leandro D. Sasiambarrena、Leticia J. Mendez、Marco A. Ocsachoque、Alicia S. Cánepa、Rodolfo D. Bravo、M. Gloria González
DOI:10.1007/s10562-010-0389-x
日期:2010.9
The synthesis of 3,4-dihydro-1H-2,3-benzothiazine 2,2-dioxides and 1,2,4,5-tetrahydro-3,2-benzothiazepine 3,3-dioxides is studied using sulfated zirconia as catalyst. The sulfated zirconia calcined at 550 A degrees C achieved a high selectivity which is attributed to the formation of a tetragonal phase. In addition, the catalyst can be reused up to three times without loss of its catalytic activity.
Heteropolyacid as an Efficient Catalyst for Synthesis of 3,4-Dihydro-1H-2,3-benzothiazine-2,2-dioxides
作者:Alicia S. Cánepa、Leandro D. Sasiambarrena、Rodolfo D. Bravo
DOI:10.1080/00397910802219585
日期:2008.7.24
A facile and efficient method for the formation of 3,4-dihydro-1H-2,3-benzothiazine 2,2-dioxides 2, compounds from benzylsulfonamides and formaldehyde is described using heteropolyacids H3PW12O40 and H3PMo12O40 supported on silica as catalysts.