Výsledky vyhledávání - "J S, Bontekoe"

On the tuberculostatic activity of the thiazole carboxylic acid hydrazides

Publikováno v: Recueil des Travaux Chimiques des Pays-Bas. 72:262-268

The high anti-tuberculosis activity of pyridine-4-carboxylic acid hydrazide (isonicotinic acid hydrazide, INH), together with the chemical similarity of pyridine and thiazole, has induced us to synthesize the thiazole carboxylic acid hydrazides and t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::97a1961fa96f0851cc349cfc3c2ee1ca
https://doi.org/10.1002/recl.19530720314

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A synthesis of oxytocin

Autor: J. S. Bontekoe, A. C. Koch, H. C. Beyerman

Publikováno v: Recueil des Travaux Chimiques des Pays-Bas. 78:935-946

The synthesis is described of the “protected” linear nonapeptide: N-benzyloxycarbonyl-S-benzyl-L-cysteinyl-L-tyrosyl-L-isoleucyl-L-glutaminyl-L-asparaginyl-S-benzyl-L-cysteinyl-L-prolyl-L-leucylglycine amide (XI). In the new reaction steps N,N′

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::79272c66ccb0bb421137486635cda08c
https://doi.org/10.1002/recl.19590781202

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The synthesis of compounds structurally related to isonicotinic acid hydrazide

Autor: H. C. Beyerman, W. J. van der Burg, W. L. C. Veer, J. S. Bontekoe

Publikováno v: Recueil des Travaux Chimiques des Pays-Bas. 73:109-117

The synthesis is described of a number of 1- and 4-substituted derivatives of pyridine related to isonicotinic acid hydrazide (INH) and of isonicotinoyl hydrazones of some aldehydes. These compounds were prepared in order to test them for possible gr

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3fe510352c6dfa2e20b9f38ac1e9a864
https://doi.org/10.1002/recl.19540730205

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The synthesis of thiazole-2- and of thiazole-5- carboxylic acid via a halogen-metal exchange reaction)

Autor: J. S. Bontekoe, H. C. Beyerman, P. H. Berben

Publikováno v: Recueil des Travaux Chimiques des Pays-Bas. 73:325-332

Two syntheses of the hitherto unknown 5-bromothiazole are described. 2-Bromothiazole and 5-bromothiazole could be converted via the corresponding thiazolyllithium compounds into thiazole-2- and thiazole-5-carboxylic acid respectively. This constitute

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a74bb6b0df724020f654bf58e23a5571
https://doi.org/10.1002/recl.19540730405

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Synthesis of an analogue of lysine-vasopressin, with phenylalanine 'replaced' by two consecutive tyrosyl radicals

Autor: H. C. Beyerman, J. S. Bontekoe

Publikováno v: Recueil des Travaux Chimiques des Pays-Bas. 79:1165-1173

A synthesis is described of the protected linear decapeptide: N-benzyloxycarbonyl-S-benzyl-L-cysteinyl-L-tyrosyl-L-tyrosyl-L-tyrosyl-L-glutaminyl-L-asparaginyl-S-benzyl-L-cysteinyl-L-prolyl-Ne-p-toluene-sulphonyl-L-lysylglycineamide (VI) in analytica

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::14f46254f457b1f2ce5ee7263a5100dd
https://doi.org/10.1002/recl.19600791111

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Investigations on sterols. 40. The synthesis of ring D substituted 9β,10α-steroids

Autor: M. P. Rappoldt, S. J. Halkes, A. B. van Etten, J. S. Bontekoe, T. L. Postmus

Publikováno v: Recueil des Travaux Chimiques des Pays-Bas. 98:78-81

The retro configuration (9β,10α) was introduced into pregnane derivatives containing substituents at C(16) and/or C(17) by irradiation of a suitable 5,7-diene. In this way the title compounds became much more accessible than by the introduction of

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::96e67e58db10566e52346a3ef970ea9d
https://doi.org/10.1002/recl.19790980307

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Synthesis of the N-terminal octapeptide sequence derived from glucagon

Autor: J. S. Bontekoe, H. C. Beyerman

Publikováno v: Recueil des Travaux Chimiques des Pays-Bas. 83:255-275

A synthesis is described of the N-terminal octapeptide sequence derived from the pancreatic hormone glucagon (glucagon 1–8).

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::78f7db606a5e450199ccffce87c58b92
https://doi.org/10.1002/recl.19640830306

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The synthesis of p-guanidino-salicylic acid and some related compounds

Autor: H. C. Beyerman, J. S. Bontekoe

Publikováno v: Recueil des Travaux Chimiques des Pays-Bas. 72:643-652

The syntheses of 4-guanidino-salicylic acid, 4-(N′-cyanoguanidino)- salicylic acid, and some related compounds are described. Intermolecular coupling of the diazonium salt of ρ-amino-salicylic acid and of its methyl ester yielded products which ar

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::786634dcfa8937a44b46fcee0fbefa2c
https://doi.org/10.1002/recl.19530720802

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Synthesis of the C-terminal tetrapeptide sequence derived from glucagon

Autor: J. S. Bontekoe, H. C. Beyerman

Publikováno v: Recueil des Travaux Chimiques des Pays-Bas. 81:699-709

A synthesis is described of the partially protected carboxyl-terminal tetrapeptide sequence, L-leucyl-L-methionyl-L-asparaginyl-O-t-butyl-L-threonine t-butyl ester, which is derived from the pancreatic hormone glucagon. In this synthesis we used succ

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5e236f547ba955090eed188ea7939f78
https://doi.org/10.1002/recl.19620810809

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