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ChemInform Abstract: Synthesis of Novel Dihydrothiazolo(3,2-a)pyrimidinone Derivatives

Autor: T. P. Selby, B. K. Smith

Publikováno v: ChemInform. 21

Condensation of 2-amino-4-hydroxy-2-mercaptopyrimidine (2) hydrate and ethyl 4-bromocrotonate gave a mixture of ethyl 7-amino-2,3-dihydro-5-oxo-5H-thiazolo [3,2-a] pyrimidine-3-acetate (4) and 2a,3-dihydro-1-thia-5,8,8b-triazaacenaphthylene-4,7(2H)-d

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3c0f30ff1f155cdafec96847b6893564
https://doi.org/10.1002/chin.199010206

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Thiazoles and thiadiazines. The condensation of ethyl 4-chloroacetoacetate with thiosemicarbazide

Autor: T. P. Selby, E. Campaigne

Publikováno v: Journal of Heterocyclic Chemistry. 15:401-411

By varying the acidity, solvent polarity, and temperature when thiosemicarbazide reacted with ethyl 4-chloroacetoacetate, ethyl 2-amino-6H-1,3,4-thiadiazine-5-acetate hydrochloride, ethyl 2-hydrazinothiazole-4-acetate, and ethyl 2-imino-3-aminothiazo

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a4d9aac7a941be4d3df57552f97243c3
https://doi.org/10.1002/jhet.5570150308

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Synthesis and crystal structure of a covalently hydrated 8-thia-1,4-diazacycl[3.3.2]azine

Autor: T. P. Selby, J. C. Huffman, E. Campaigne

Publikováno v: Journal of Heterocyclic Chemistry. 16:725-729

Condensation of ethyl 4-chloroacetoacetate with 4-amino-6-hydroxy-2-pyrimidinethiol produced ethyl 3-hydroxy-5-amino-7-oxothiazolino[3,2-a]pyrimidin-3-acetate (7a) on crystallization. Subsequent ring closure of 7a produced the tricyclic 6a-hydroxy-5,

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f1e305d8bab1618d97d3c96c3eceac3f
https://doi.org/10.1002/jhet.5570160423

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Synthesis and structure elucidation of 3-methoxy-1-methyl-1H-1,2,4,-triazol-5-amine and 5-methoxy-1-methyl-1H-1,2,4,-triazol-3-amine

Autor: G. E. Lepone, T. P. Selby

Publikováno v: Journal of Heterocyclic Chemistry. 21:61-64

Previously it was shown that condensation of dimethyl N-cyanodithioimidocarbonate (1a) with methylhydrazine gave predominantly 1-methyl-5-methylthio-1H-,2,4-triazol-3-amine (2), which was initially identified erroneously as the regioisomer l-methyl-3

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f6393df06d9b46eea699166439fe2b73
https://doi.org/10.1002/jhet.5570210114

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Synthesis of a novel 8-thia-1,4-diazacycl[3.3.2] azine

Autor: E. Campaigne, T. P. Selby

Publikováno v: Journal of Heterocyclic Chemistry. 16:151-156

A unique covalently hydrated cyclazine adduct, 2-imino-6a-hydroxy-4,5,6,6a-tetrahydro-7H-8-thia-J, 4-diazacycl[3.3.2]azin-5-one hydrochloride was prepared by reacting ethyl 4-chloro-acetoacetate with 4,6-diamino-2-thiopyrimidine in neutral alcohol. N

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b37de0e812a4644f316bce21601daaca
https://doi.org/10.1002/jhet.5570160128

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Synthesis of novel dihydrothiazolo[3,2-a]pyrimidinone derivatives

Autor: B. K. Smith, T. P. Selby

Publikováno v: Journal of Heterocyclic Chemistry. 26:1237-1240

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5d3135a38701a7017ebc303723c1c1e9
https://doi.org/10.1002/jhet.5570260506

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Structure and reactions of a thiazolino[3,2-a]pyrimidine carbinolamine

Autor: T. P. Selby, K. Folting, E. Campaigne, John C. Huffman

Publikováno v: Journal of Heterocyclic Chemistry. 18:575-580

Ethyl 4-chloroacetoacetate condenses with 4-amino-6-hydroxy-2-pyrimidinethiol to yield ethyl 3-hydroxy-5-oxo-7-aminothiazolino[3,2-a]pyrimidin-3-acetate (3), and not ethyl 3-hydroxy-5-amino-7-oxothiazolino[3,2-a]-pyrimidin-3-acetate, as previously re

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4ffce04aa78104c806bfdfc1960d05b1
https://doi.org/10.1002/jhet.5570180328

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Nitrosation and hydrolysis studies of some thiazole-4-acetic esters

Autor: E. Campaigne, T. P. Selby

Publikováno v: Journal of Heterocyclic Chemistry. 17:1249-1253

Nitrosation of hydrazino substituted thiazole-4-acetates has been shown to occur on the ring, rather than the α-methylene carbon, as previously reported. Thus nitrosation of ethyl 2-isopropylidenehydrazono-, 2-benzylidenehydrazono-, 2-(2-benzoylhydr

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9165811da3aded9f8a590f910c1d3386
https://doi.org/10.1002/jhet.5570170621

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