Thiazolo pyridinium

In the case of a pyridinium salt, an indirect proof of the correctness of this mechanism can be found in the presence of a heptamethine thiazolo-cyanine, together with monomethine. which results unambiguously from 19 by the known opening of the pyridine ring (Scheme 25) (52). [Pg.41]

Thiazolo[5,4-6]pyridine, 2-methylthio- H NMR, 6, 674 (76JHC491) Thiazolo[3,2-a]pyridinium... [Pg.66]

X-ray, 6, 670 (71ACS1352) Thiazolo[3,2-a]pyridinium, anhydro-2-bromo-8-hydroxy-... [Pg.66]

Thiazolo[3,2-a]pyridinium, anhydro-5-chloro-2,3-dihydro-8-hydroxy- H NMR, 6, 675 <77ACS(B)919) Thiazolo[3,2-a]pyridinium, anhydro- 2a,3y8-dicarboxy-2,3 -dihy dro-5-methyl-X-ray, 6, 670 (71 ACS 118) Thiazolo[3,2-a]pyridinium, anhydro-2,3-dihydro-8-hydroxy-... [Pg.67]

Thiazolo[3,2-a]pyridinium, 3-(4-bromophenyl)-X-ray, 6, 669 (80AX(B)1229) Thiazolo[3,2-a]pyridinium, 3-carboxy-2,3-dihydro-8 hydroxy-5-methyl- C NMR, 6, 678 (82UP42900) Thiazolo[3,2-a]pyridinium, 2,3-dihydro- C NMR, 6, 678 (82UP42900) Thiazolo[3,2-a]pyridinium, 2,3-dihydro-2,5-dimethyl-... [Pg.67]

UV, 6, 679 (69JCS(C)707, 71BSF1491) Thiazolo[3,4-a]pyridinium, 7-bromo-8-hydroxy-3-methyl-... [Pg.67]

Thiazolo[3,2-a]pyridinium hydroxide, anhydro-7-bromo-3a-carboxy-2,3-dihydro-8-hydroxy-2ft5-dimethyl-l 0-0X0-X-ray diffraction, 6, 670... [Pg.877]

Thiazolo[3,2,-a]pyridinium hydroxide, anhydro-8-hydroxy-photolysis, 6, 682... [Pg.877]

Thiazolo[3,2-a]pyridinium salts, 3-carboxydihydro-optically active synthesis, 6, 705... [Pg.877]

Thiazolo[3,2-a]pyridinium salts, 3-carboxy-2,3-dihydro-8-hydroxy-8-methyl-desulfbrization, 6, 687-688 Thiazolo[3,2-a]pyridinium salts, 6(8)-nitro-2,3-dihydro-... [Pg.877]

Aza-2-benzoylbicyclo[3.3.1]nonan-8-one (217) has been used for the S3mthe-sis of isomeric thiazolo[4,5-c]azocine 221 (83CPB2094). Bromination of 217 in the a-position by pyridinium dibromide hydrobromide and condensation of bromoketone 218 with thiourea leads to aminothiazoloazocine 219. Successive deamination of 219, the removal of N-benzoyl protection and methylation gives the target azocine 221 (Scheme 61). [Pg.115]

A number of syntheses of substituted 2,3 -bipyridines are worthy of note. Tetracyclone heated at 215°C with nicotinonitrile affords 3,4,5,6-tetraphenyl-2,3 -bipyridine, whereas 3,4-di(2-pyridyl)pyridine is obtained by an oxidative degradation of the corresponding 6,7-disubstituted thiazolo[3,2-a]-pyridinium salt. Nicotinic acid on UV irradiation in aqueous solution at pH 4-6 gives 2,3 -bipyridine-5-carboxylic acid, whereas irradiation of picolinic acid in the same pH range in the absence of metal ions gives some 2,3 -bipyridine. 6,6 -Diphenyl-2,3 -bipyridine is thought to be formed from... [Pg.315]

The photochemical and thermal transformations of 5-methyldihydro-thiazolo[3,2-a]pyridinium-8-olate (515) have been investigated. Irradiation using a Hanovia mercury lamp and Pyrex filter gives the isomeric pyridone 516 (4%). When a Rayonet reactor was used, a product which appears to be the valence tautomer 517 (6%) was isolated. Further irradiation of 517 gave... [Pg.107]

Methylthiazolium salts (119) with a-dicarbonyl compounds give thiazolo[2,3-6]pyridinium salts... [Pg.678]

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