5-Acetyl-2,3-dihydro-l,4-thiazine

Another popcorn-like odorant, 5-acetyl-2,3-dihydro-l,4-thiazine (T= 1.25 ppb), is formed from diacetyl and cysteamine, optimally at pH 7, whereas formation from cysteine and carbohydrate has its optimum at pH 5.270 The mechanism was depicted... 

Group 3 volatiles, formed by further interactions, can reach even lower threshold values than those mentioned so far, particularly when sulfur is involved, usually derived by the break down of cysteine (bis(2-methyl-3-furyl) disulfide, 0.00002 2-methyl-3-furanthiol, 0.0004 2-furylmethanethiol, 0.005 dimethyl trisulfide, 0.01 dimethyl disulfide, 0.16 dimethyl sulfide, 0.3 hydrogen sulfide, 10). Into some volatile sulfur compounds other atoms as well as the sulfur of cysteine are incorporated (2-acetylthiazoline, 1 5-acetyl-2,3-dihydro-l,4-thiazine, 1.25 2-acetylthiazole, 10). Other volatiles are more likely to be derived from methionine (methanethiol, 0.2). 

T. Hofmann, R. Hassner, and P. Schieberle, Determination of the chemical structure of the intense roasty, popcorn-like odorant 5-acetyl-2,3-dihydro-l,4-thiazine, J. Agric. Food Chem., 1995, 43, 2195-2198. 

Chemistry of important flavor compounds, viz., 2-acetyl-l-p)nToline, 6-acetyl-l,2,3,4-tetrahydropyridine, 2-acetyl-2-thiazoline, and 5-ace-tyl-2,3-dihydro-4H-thiazine 06CRV2299. 

Cl 2H18CI4CUN4OS, Thiamine tetrachlorocuprate, 40B, 553 Cl2H18N2O3S, 2,3-Dihydro-2-acetyl-3,3-dimethyl-4 [(lE)-4-methyl-1,3-pentadienyll l,2,5-thiadiazole 1,1-dioxide, 46B, 403 C12H18N4O3S, 2,7-Dimethylthiachromine-8-ethanol dihydrate, 40B, 350 Cl2H19N2O4PS, N-(2,6-Dimethylphenyl)-2-amino-5,6-dihydro-4H-1,3-thiazine phosphate, 45B, 429... 

Phenyl-l,2,3,6-tetrahydropyrido[2,l- ][l,3]thiazino[3,2- ]quinolin-6-ones were prepared by the reaction of 2-mercapto-5-phenyl-l,4-dihydroquinolin-4-ones with 1,3-dihalopropane <1997JAK97/278780>. 7-Acetyl-2-aryl-9-cyano-6-methyl-8-phenyl-3,4-dihydro-277,877-pyrido[2,l- ][l,3]thiazin-4-ones were obtained from 5-acetyl-3-cyano-6-methyl-4-phenyl-l,2,3,4-tetrahydropyridine-2-thione with 3-aryl-2-propenoyl chloride <2002CHE761>. Reaction... 

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