Jürgen Martens | Carl von Ossietzky University of Oldenburg (original) (raw)
Professor of Organic Chemistry at Carl von Ossietzky University Oldenburg (Germany)
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Papers by Jürgen Martens
ChemInform, Dec 12, 2000
ABSTRACT
Related Article: W.Maison, A.Lutzen, M.Kosten, I.Schlemminger, O.Westerhoff, W.Saak, J.Martens|20... more Related Article: W.Maison, A.Lutzen, M.Kosten, I.Schlemminger, O.Westerhoff, W.Saak, J.Martens|2000|J.Chem.Soc.,Perkin Trans.1||1867|doi:10.1039/b002258f
Angewandte Chemie, 1974
... H. Bosshardt und Prof. Dr. M. Hesse Organisch-Chemisches Instittit der Univcrsitat Ziirich CH... more ... H. Bosshardt und Prof. Dr. M. Hesse Organisch-Chemisches Instittit der Univcrsitat Ziirich CH-X001 Ziirich, Rimistrdk 76 (Schweiz) ... 2.2. Verlust von Ammoniak oder Amin aus [M-Acyl] +-Ionen Im Spektrum von N,N'-Tetramethylen-diacetamid (2) (Abb. ...
Chemischer Informationsdienst, 1973
Heteroatom Chemistry, 1998
For the first time, an approach to cyclic α-amino phosphonate structures bearing a 5,6-benzo[1,3,... more For the first time, an approach to cyclic α-amino phosphonate structures bearing a 5,6-benzo[1,3,2]diazaphosphorinan-4-one 2-oxide framework is described. The desired products, 4 and 5, were prepared by a modified Pudovik reaction, starting from the benzodiazaphosphorinanone derivative 1 and several sulfur-containing five- and six-membered heterocycles, 2, and 3 (with a reactive C=N double bond) as imine component (yields up to 81%). Furthermore, the diastereoselectivity of the reaction was investigated (dr up to 62:38). © 1998 John Wiley & Sons, Inc. Heteroatom Chem 9: 679–686, 1998
PURPOSE: To obtain the subject alcohol important as a chiral catalyst in a high yield and enantio... more PURPOSE: To obtain the subject alcohol important as a chiral catalyst in a high yield and enantiomeric purity by a reduced number of reaction steps. CONSTITUTION: An N-silylated amino acid silylester (A) represented by formula I (wherein R 1 is a 1-20C alkyl, aryl or the like; R 2 is H, a 1-20C alkyl or the like; R 4 is a 1-4C alkyl; and * is the asymmetric center) and a Grignard reagent (B) obtained from Mg and a compd. represented by Y-R 3 (wherein Y is a halogen; and R 3 is a 1-20C alkyl, aryl or the like) are reacted in a diluent having an ether structure pref. at a temp. of 0-20°C and the reaction mixture is cooled after the completion of reaction and poured into cold hydrochloric acid, and the precipitated hydrochloride is isolated. Subsequently, this hydrochloride is dissolved in an aq. base to be extraction-treated with an org. solvent and the extract is evaporated and concn. to obtain to an objective homochiral amino- alcohol represented by formula II. COPYRIGHT: (C)1995,JPO
Chemischer Informationsdienst, 1978
ChemInform Abstract Die Verbindungen (I), die aus den entsprechenden Benzoylchloriden und Kalium-... more ChemInform Abstract Die Verbindungen (I), die aus den entsprechenden Benzoylchloriden und Kalium-O-ethyl-xanthogenat erhalten werden, ergeben bei der Bestrahlung im Fall (Ia) die Verbindungen (II), (III) und (IV), aus (Ib) wird statt (IV) das Thioanhydrid (V) gebildet. Eine Dimerisierung zu (VI) wird in keinem Fall beobachtet.
Chemischer Informationsdienst, 1976
Chemischer Informationsdienst, 1975
Tetrahedron, 2016
A novel and efficient one-pot three-component reaction for the synthesis of dithiocarbamates at r... more A novel and efficient one-pot three-component reaction for the synthesis of dithiocarbamates at room temperature under solvent- and catalyst-free conditions, starting from readily available amines, CS2 and vinyl pyridines and vinyl pyrazine is reported. Excellent yield, green reaction conditions, and complete regioselectivity toward anti-Markovnikov adducts are particular advantages of this work.
Chemischer Informationsdienst, 1979
Tetrahedron, 2015
A convenient multicomponent reaction for the synthesis of a variety of rarely investigated 1,3ben... more A convenient multicomponent reaction for the synthesis of a variety of rarely investigated 1,3benzothiazine-2-thiones using carbon disulfide, primary amines and ortho-halogenated benzaldehydes as commercially available substrates is reported. Additionally, the high performance of the newly developed one-pot procedure enables a direct route to a wide range of analog annulated polyheterocyclic structures. The potential of these compounds for the late-stage elaboration of high-functionalized molecules by simple synthetic operations is demonstrated in selected subsequent derivatizations giving heterocyclic products of high diversity.
Synthetic Communications, 1994
Liebigs Annalen Der Chemie, 1994
ChemInform, Dec 12, 2000
ABSTRACT
Related Article: W.Maison, A.Lutzen, M.Kosten, I.Schlemminger, O.Westerhoff, W.Saak, J.Martens|20... more Related Article: W.Maison, A.Lutzen, M.Kosten, I.Schlemminger, O.Westerhoff, W.Saak, J.Martens|2000|J.Chem.Soc.,Perkin Trans.1||1867|doi:10.1039/b002258f
Angewandte Chemie, 1974
... H. Bosshardt und Prof. Dr. M. Hesse Organisch-Chemisches Instittit der Univcrsitat Ziirich CH... more ... H. Bosshardt und Prof. Dr. M. Hesse Organisch-Chemisches Instittit der Univcrsitat Ziirich CH-X001 Ziirich, Rimistrdk 76 (Schweiz) ... 2.2. Verlust von Ammoniak oder Amin aus [M-Acyl] +-Ionen Im Spektrum von N,N'-Tetramethylen-diacetamid (2) (Abb. ...
Chemischer Informationsdienst, 1973
Heteroatom Chemistry, 1998
For the first time, an approach to cyclic α-amino phosphonate structures bearing a 5,6-benzo[1,3,... more For the first time, an approach to cyclic α-amino phosphonate structures bearing a 5,6-benzo[1,3,2]diazaphosphorinan-4-one 2-oxide framework is described. The desired products, 4 and 5, were prepared by a modified Pudovik reaction, starting from the benzodiazaphosphorinanone derivative 1 and several sulfur-containing five- and six-membered heterocycles, 2, and 3 (with a reactive C=N double bond) as imine component (yields up to 81%). Furthermore, the diastereoselectivity of the reaction was investigated (dr up to 62:38). © 1998 John Wiley & Sons, Inc. Heteroatom Chem 9: 679–686, 1998
PURPOSE: To obtain the subject alcohol important as a chiral catalyst in a high yield and enantio... more PURPOSE: To obtain the subject alcohol important as a chiral catalyst in a high yield and enantiomeric purity by a reduced number of reaction steps. CONSTITUTION: An N-silylated amino acid silylester (A) represented by formula I (wherein R 1 is a 1-20C alkyl, aryl or the like; R 2 is H, a 1-20C alkyl or the like; R 4 is a 1-4C alkyl; and * is the asymmetric center) and a Grignard reagent (B) obtained from Mg and a compd. represented by Y-R 3 (wherein Y is a halogen; and R 3 is a 1-20C alkyl, aryl or the like) are reacted in a diluent having an ether structure pref. at a temp. of 0-20°C and the reaction mixture is cooled after the completion of reaction and poured into cold hydrochloric acid, and the precipitated hydrochloride is isolated. Subsequently, this hydrochloride is dissolved in an aq. base to be extraction-treated with an org. solvent and the extract is evaporated and concn. to obtain to an objective homochiral amino- alcohol represented by formula II. COPYRIGHT: (C)1995,JPO
Chemischer Informationsdienst, 1978
ChemInform Abstract Die Verbindungen (I), die aus den entsprechenden Benzoylchloriden und Kalium-... more ChemInform Abstract Die Verbindungen (I), die aus den entsprechenden Benzoylchloriden und Kalium-O-ethyl-xanthogenat erhalten werden, ergeben bei der Bestrahlung im Fall (Ia) die Verbindungen (II), (III) und (IV), aus (Ib) wird statt (IV) das Thioanhydrid (V) gebildet. Eine Dimerisierung zu (VI) wird in keinem Fall beobachtet.
Chemischer Informationsdienst, 1976
Chemischer Informationsdienst, 1975
Tetrahedron, 2016
A novel and efficient one-pot three-component reaction for the synthesis of dithiocarbamates at r... more A novel and efficient one-pot three-component reaction for the synthesis of dithiocarbamates at room temperature under solvent- and catalyst-free conditions, starting from readily available amines, CS2 and vinyl pyridines and vinyl pyrazine is reported. Excellent yield, green reaction conditions, and complete regioselectivity toward anti-Markovnikov adducts are particular advantages of this work.
Chemischer Informationsdienst, 1979
Tetrahedron, 2015
A convenient multicomponent reaction for the synthesis of a variety of rarely investigated 1,3ben... more A convenient multicomponent reaction for the synthesis of a variety of rarely investigated 1,3benzothiazine-2-thiones using carbon disulfide, primary amines and ortho-halogenated benzaldehydes as commercially available substrates is reported. Additionally, the high performance of the newly developed one-pot procedure enables a direct route to a wide range of analog annulated polyheterocyclic structures. The potential of these compounds for the late-stage elaboration of high-functionalized molecules by simple synthetic operations is demonstrated in selected subsequent derivatizations giving heterocyclic products of high diversity.
Synthetic Communications, 1994
Liebigs Annalen Der Chemie, 1994