Zobrazeno 1 - 10 of 69 pro vyhledávání: '"F. J. Zeelen"'
1
C17-substituted 5- and 5(10)-estrenes and their 7α-methyl homologues
Autor: C. C. Bolt, F. J. Zeelen, H. P. de Jongh, N. P. Van Vliet, C. M. Siegmann
Publikováno v: Recueil des Travaux Chimiques des Pays-Bas. 88:1061-1069
17α-Alkylated derivatives of 5-estren-17β-ol and their 7α-methyl homologues have been prepared (Chart I). The key step in these syntheses is the reduction of the 3β-chloro-5-estrenes (IV) with lithium in liquid ammonia. Similar derivatives of the
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0f9c588e2edae182de2e19b8b5abf5ef
https://doi.org/10.1002/recl.19690880906
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2
Stereochemistry of electrophilic addition reactions to 22E-unsaturated sterols; a Barton rule revisited
Autor: F. J. Zeelen
Publikováno v: Recueil des Travaux Chimiques des Pays-Bas. 103:245-251
Comparison of the X-ray structures of seven 22E-unsaturated sterols shows that these have the same conformation around the double bond. This minimum-energy conformation has been used by Barton and others to explain the stereoselectivity observed in e
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a74560f7dc3da1a75f56c66677d69a18
https://doi.org/10.1002/recl.19841030901
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4
The reaction of 2-chlorocyclohexanol with brucine
Autor: F. J. Zeelen, M. E. Kronenberg, E. Havinga
Publikováno v: Recueil des Travaux Chimiques des Pays-Bas. 77:674-677
2-Chlorocyclohexanol-1 forms a clathrate compound with brucine. This reaction provides a means of obtaining chlorocyclohexanol - and related compounds - that are partially resolved into optical antipodes.
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::736faa4901b9001f5686017834f94266
https://doi.org/10.1002/recl.19580770708
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5
Biomimetic total synthesis of steroids VIII. Stereospecific synthesis of B-homo-19-norsteroids
Autor: F. J. Zeelen, Marinus B. Groen
Publikováno v: Recueil des Travaux Chimiques des Pays-Bas. 103:169-173
Cationic cyclization of 2-[7-(3-methoxyphenyl)-(E)-3-heptenyl]-3-methyl-2-cyclopentenol (7) gave mainly tetracyclic products via Ar1-6 and/or Ar2-7 participation. The major product, 3-methoxy-17-methyl-B-homo-1,3,5(10),13(17)-gonatetraene (9), was co
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e8ea8f9a61dc32c58c3717e3a0f27c27
https://doi.org/10.1002/recl.19841030505
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6
Synthesis of stearoylamino-acids
Autor: E. Havinga, F. J. Zeelen
Publikováno v: Recueil des Travaux Chimiques des Pays-Bas. 77:267-272
A series of stearoylamino-acids was synthesized by condensing stearoyl chloride with the esters of the amino-acids in a two phase system, one of chloroform and one of an aqueous solution of K2CO3 or KHCO3, followed by saponification of the stearoylam
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::cf09cb43c748c48c62b52c2ed237597a
https://doi.org/10.1002/recl.19580770308
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9
Biomimetic total synthesis of steroids X. Synthesis of 7-(methoxymethyl)- and 7-(phenylmethoxymethyl)-19-norsteroids
Autor: F. J. Zeelen, Marinus B. Groen
Publikováno v: Recueil des Travaux Chimiques des Pays-Bas. 105:549-553
Cationic cyclization of 2-[6-(m-methoxyphenyl)-5-(methoxymethyl)-(E)-3-hexenyl]-3- methyl-2-cyclopentenol 23a and of the phenylmethoxymethyl analogue 23b has been studied. Although oxygen participation with the cyclization by the ether group is possi
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c5844345afe2b58f0c50d50a3ffc40fe
https://doi.org/10.1002/recl.19861051206
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