L-Benzyl-2-mercapto

Triazole ring cleavage of the 7-amino-5-benzyl-5-mercapto-l,2,4-triazolo-[l,5-c]pyrimidinium iodide 135 at the N3-N4 bond occurred upon treatment with potassium carbonate to give the 4-amino-2-benzylmercapto-l-methyl-... 

So wird aus l-Benzyl-4-brom-5-formyl-2-phenyl-imidazol und Natriumazid in 52% Ausbeute 4-Azido-l-benzyl-5-formyl-2-phenyl-imidazol erhalten, wahrend die Umsetzung von 1-Benzyl-4-brom-5-formyl-imidazol kein definiertes Produkt liefert922 Mit Mercapto-essigsaure-cthyl-ester und Natriummethanolat reagieren 1-substituierte 4-Brom-5-formyl-imidazole unter nukleophiler Substitution des Brom-Atoms durch den Thiolat-Rest und anschlieBender Kon-densation der Methylen-Gruppe mit der Aldehyd-Funktion zu den entsprechenden 2-Ethoxy-car bon yl-4H-[Pg.165]

Mercapto-l,3-benzothiazol ergibt mit Formaldehyd/2,6-Di-tert.-butyl-phenol 3-(3,5-Di-tert.-butyl-4-hy-droxy-benzyl )-2-thiono-2,3-dihydro-1,3-henzothiazol1020 ... 

An aq. soln. of K-(orNa-)2-mercapto-2-benzyl-l-cyanoacrylonitrile added to excess diloramine soln. prepared at 0 from Na-hypochlorite and NH3 in water under UV-irradiation 3-amino-5-benzylisothiazole-4-carbonitrile. Y 93%. F. e. s. K. Hartke and L. Peshkar, Arch. Pharm. 301, 611 (1968). 

Oxo-7.phenyl-4.5.6.7.tetrahydro-2.3>benzo-1.4-heptathiazia 27 II 271. 2.Mercapto-4.5.diphenyl-d. ozazoli]i27,221. 2.Benzyl-l -thlo-phenmotpholoa-(3)... 

When the 3-thiourea derivative (59) was heated in boiling ethanol for 3 h, and then the evaporated reaction mixture was treated with 10% NaOH solution at 100°C for 20 min, anhydro 2-methyl-3-mercapto-4-hydroxy-5,6,7,8-tetrahydro[l,2-6]pyridazinium hydroxide (61) was obtained (71CPB159). The mercapto group was alkylated with benzyl bromide and was treated with HgCla in boiling ethanol to yield the 3-chloromercurithio derivative. Anhydro 3,4-dihydroxy-2-methyl-5,6,7,8-tetrahydropyrido[l,2-f ]pyridazinium hydroxide (62) was O-acylated with acetic anhydride, but the structure of the product was not elucidated (71CPB159). 

Methazolamide Methazolamide, N-(4-methyl-2-sulfamoyl-l,3,4-thiadiazol-5-yliden) acetamide (21.2.3), is made by an intermediate product of acetazolamide synthesis— 2-acetylamino-5-mercapto-l,3,4-thadiazol (9.7.3). This is benzylated with benzylchloride at the mercapto group, forming 2-acetylamino-5-benzylthio-l,3,4-thiadiazole (21.2.1). Further methylation of the product with methyl iodide leads to the formation of N-(4-methyl-2-benzylthio-l,3,4-thiadiazol-5-yliden)acetamide (21.2.2). Oxidation and simultaneous chlorination of the resulting product with chlorine in an aqueous solution of acetic acid, and reacting the resulting chlorosulfonic derivative with ammonia gives (21.2.3) [5-7]. 

In contrast with the meso-ionic l,2,3-triazol-4-ones (176) which are relatively stable to heat, the meso-ionic l,2,3-triazole-4- ones (196) rearrange when heated in benzene solution at 18Q°. Under these conditions, anhydro-1 -benzyl-3-methyl-4-mercapto-1,2, -triazolium hydroxide... 

The diastereoselective cycloaddition of 2-phenyl-4-dimethylamino-l-thia-3-azabuta-l,3-diene with a choice of dienophiles and in the presence of a Lewis acid provides a convenient route to 5,6-dihydro-4//-l,3-thiazines <2002TL6067, 2004T1827>. The more stable /ra r-adducts are produced exclusively. The approach using (4A)-3-acryloyl-4-benzyloxazolidin-2-one 198 provides access to the chiral 5,6-dihydro-4//-l,3-thiazine 199 <2004T1827>. The exceptional level of selectivity is only achieved when magnesium bromide is used. The chiral auxiliary was removed by reaction with lithium benzoxide to give the benzyl ester 200, and reaction with catalytic amount of samarium triflate and methanol provides the methyl ester 201 (Scheme 21). 2-Substituted-5,6-dihydro-l,3-thiazines are conveniently synthesized from nitriles or thiocyanates and 4-mercapto-2-methylbutan-2-ol to produce... 

Benzylsulfanyl-5-phenyl-[l,2,4]triazol-4-ylmethyl)-benzamide (33). A solution of 4-(3-mercapto-5-phenyl-[l,2,4]triazol-4-ylmethyl)-ben-zamide (32, 0.1 mmol) in THF (6 ml) was treated with Amberlite resin (OH form, 0.1 mmol OH ) and benzyl bromide (0.15 mmol). The resulting mixture was shaken at room temperature until complete consumption... 

Benzyl mercaptan a-Toluenethiol (8) Benzenemethanethlol (9) (100-53-8) cis- and trans-5-Methyl-2-[l-raethyl-l-(phenylmethylth1o)ethyl]cyclohexanone Cyclohexanone, 5-methyl-2-[l-methyl-l-[(phenylmethyl]thio]ethyl]-, (2R-trans)-(10) (79563-58-9) (2S-c1s)- (10) (79618-04-5) 2-(l-Mercapto-l-methylethyl)-5-raethylcyclohexanol Cyclohexanol-2-(1-mercapto-l-methylethyl)-5-methyl-, [iR-(ia, 2a, 5a)]- (10) ... 

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