Syntheses of, and structural studies on, benzo-fused 1,2,4-thiadiazines
作者:Ewan R. Clark、John J. Hayward、Bryce J. Leontowicz、Dana J. Eisler、Jeremy M. Rawson
DOI:10.1039/c3ce42205d
日期:——
The syntheses of nine benzo-fused-1,2,4-thiadizines are reported. The use of microwave synthesis has been shown to afford high yields and short reaction times in several key reaction steps. The molecular geometries of these heterocycles are discussed and their solid state packing motifs reveal a strong tendency for the N–H group to form hydrogen bonded chains.
Copper-promoted aerial oxidation of benzothiadiazines: access to benzothiadiazine S-oxide heterocycles
作者:Ewan R. Clark、John J. Hayward、Bryce J. Leontowicz、Muhammad U. Anwar、Melanie Pilkington、Jeremy M. Rawson
DOI:10.1039/c4dt03467h
日期:——
Aerial oxidation of benzothiadiazines selectively affords the corresponding benzothiadiazine S-oxides in the presence of Cu2+ ions. Structural studies reveal that the S-oxide appears to be a strong hydrogen-bond acceptor.
Gilchrist, Thomas L.; Rees, Charles W.; Vaughan, David, Journal of the Chemical Society. Perkin transactions I, 1983, # 1, p. 55 - 59
作者:Gilchrist, Thomas L.、Rees, Charles W.、Vaughan, David
DOI:——
日期:——
Experimental and Theoretical Studies of Fused-Ring Persistent [1,2,4]Thiadiazinyl Radicals
作者:Józef Zienkiewicz、Piotr Kaszynski、Victor G. Young
DOI:10.1021/jo0486746
日期:2004.10.1
Five persistent radicals la-le were generated by the oxidation of 4H-[1,2,4]thiadiazines 2a-2e and studied with ESR and UV-vis spectroscopy. Three of the radicals, 1a, 1d, and 1e, were generated in high yields (>90%) using either SO2Cl2/amine in toluene or AgO/K2CO3 in a toluene/MeCN mixture. Halogenated radicals 1d and le were sufficiently stable for chromatographic isolation and vacuum sublimation. The solution stability of the fluorinated 1d was measured at t(1/2) approximate to 4 months in the absence of oxygen, and le at t(1/2) approximate to 40 min in the presence of air. The crystal and molecular structures of 1d were determined by X-ray crystallography showing columns of parallel almost evenly spaced planar heterocycles connected by infinite ...N...S... chains. Cyclic voltammetry of 1d and le shows reversible reduction waves at about 0 V and irreversible oxidations at about 1.2 V. Spectral and electrochemical properties of 1 were well reproduced by DFT methods.
FINCH N.; RICCA S. JR.; WERNER L. H.; RODEBAUGH R., J. ORG. CHEM., 1980, 45, NO 17, 3416-3421
作者:FINCH N.、 RICCA S. JR.、 WERNER L. H.、 RODEBAUGH R.