Zobrazeno 1 - 10
of 306
pro vyhledávání: '"Günther Snatzke"'
Publikováno v:
Liebigs Annalen. 1996:349-355
The addition of the chiral nucleophiles Na-2 and Li-5 to pyridinium compounds 1 and the subsequent ring closure (Pictet-Spengler cyclization) to indoloquinolizines 3a and 7b, respectively, proceed stereoselectively (d.e. for 3a: 54%; for 7b: ≥95%).
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3f1a9c03c005792229856a6986a8a25b
https://doi.org/10.1002/jlac.199619960309
https://doi.org/10.1002/jlac.199619960309
Autor:
Jodwiga Frelek, Farnaz Malik, Günther Snatzke, Wolfgang Voelter, Mashooda Hasan, Shahnaz Perveen, Khalid Mohammed Khan
Publikováno v:
Zeitschrift für Naturforschung B. 51:588-598
From thirty three new optically active 1,5-benzodiazepine derivatives the UV and CD data are reported and the bands discussed related to corresponding electronic transitions respectively stereochemical features.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ba33c4bba0c6f1909dc0e995f5e064ed
https://doi.org/10.1515/znb-1996-0425
https://doi.org/10.1515/znb-1996-0425
Autor:
Günther Snatzke, Shahnaz Perveen, Mashooda Hasan, Khalid Mohammed Khan, Farnaz Malik, Wolfgang Voelter
Publikováno v:
Zeitschrift für Naturforschung B. 50:1869-1882
From forty one chiral benzodiazepin-2-ones the UV and CD data are reported and the bands discussed with respect to corresponding electronic transitions respectively stereochemical features.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3011361dd0525336c024602326e761ee
https://doi.org/10.1515/znb-1995-1214
https://doi.org/10.1515/znb-1995-1214
Publikováno v:
Tetrahedron. 51:12911-12922
The reaction between 2-phenylthiobenzhydrazide and aldoses has been investigated; the products obtained in these reactions have the structure of 2-polyhydroxyalkyl-Δ4-1,3,4-thiadiazolines as shown by spectroscopic evidence and by single crystal X-ra
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e61b0b8d7751bfedebba6269f99197b4
https://doi.org/10.1016/0040-4020(95)00732-n
https://doi.org/10.1016/0040-4020(95)00732-n
Autor:
Günther Snatzke, Wolfgang Voelter, Helmut Duddeck, Shahnaz Perveen, Mashooda Hasan, Farnaz Malik, Khalid Mohammed Khan
Publikováno v:
Liebigs Annalen. 1995:1861-1869
A route to optically active variously substituted 4-methyl- and 4-methyl-7-substituted 1,3,4,5-tetrahydro-2H-1,5-benzo-diazepin-2-ones as analogues of commercially available Lofendazam (7-chloro-5-phenyl-1,3,4,5-tetrahydro-2H-1,5-benzodiazepin-2-one,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9a04c84e260e9ec797aa60da2a462182
https://doi.org/10.1002/jlac.1995199510261
https://doi.org/10.1002/jlac.1995199510261
Autor:
Mashooda Hasan, Helmut Duddeck, Khalid Mohammed Khan, Naghmana Rashid, Wolfgang Voelter, Günther Snatzke
Publikováno v:
Liebigs Annalen. 1995:889-896
Syntheses of 5α-cholesteno[3,2-d]- (5a), [2,3-d]- (12a), and [3,4-d]pyrimidines (15a) have been achieved by using hydroxymethylene derivatives of relevant cholestanones prepared from cholesterol (1). Their CD spectra exhibit at least three Cotton ef
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c00a2870eea48e18012bded9011d1463
https://doi.org/10.1002/jlac.1995199505130
https://doi.org/10.1002/jlac.1995199505130
Publikováno v:
Liebigs Annalen der Chemie. 1994:497-502
The correlation between the absolute configuration and CD of aza- and thiaflavanone (1, 2) is discussed: the 2R configuration for the laevorotatory enantiomers has been established by a comparison of their CD data with those of (S)-(−)-3. For the C
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c5c3b1517e880e8622356d5e51be68fa
https://doi.org/10.1002/jlac.15619940509
https://doi.org/10.1002/jlac.15619940509
Publikováno v:
Pure and Applied Chemistry. 66:2057-2062
Synthesis of unsubstituted 5X'-cholesteno(3,2-d)- (5), (2,3-d)- (12), (3,4-d)(15) and 5.C- and 5 ~-cholest-3-eno(4,3-d)pyrimidines (21) and (21') has been achieved using hydroxymethylene derivatives of relevant cholestanones prepared from cholesterol
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e3e06a0c24b1b978ebb4ab67ac4a5a9e
https://doi.org/10.1351/pac199466102057
https://doi.org/10.1351/pac199466102057
Autor:
Norbert Sdunnus, Karl Peters, Hans Georg von Schnering, Eva-Maria Peters, Günther Snatzke, Brigitta Popp, Werner Tochtermann, Frank Ott, Ulrike Schlösser
Publikováno v:
Chemische Berichte. 126:1733-1742
Synthesis of Medium and Large Rings, XXXIII[1].–Optically Active 3a,6-Methanohydroazulenes via Chiral Induction of the Solid-State Photochemical Rearrangement of Bis(1,2:5,6-di-O-isopropylidene-α-D- and -α-L-glucofuranos-3-O-yl) 3,6-Hexanooxepine
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8fcbc205582b459230148cde431c2d62
https://doi.org/10.1002/cber.19931260733
https://doi.org/10.1002/cber.19931260733
Publikováno v:
Journal of Molecular Catalysis. 79:55-74
Asymmetric reactions on chiral bis (diphenylphosphine) metal complexes having C2 symmetry axis of the chelate ring obey the simple stereochemical rules which establish a relationship between the product configuration and complex conformation. The ste
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::479248297aa92439cbaf907b3121c521
https://doi.org/10.1016/0304-5102(93)85091-7
https://doi.org/10.1016/0304-5102(93)85091-7