Tietze

Kummer S, Kulzer F, Kettner R, Basche T, Tietz C, Glowatz C and Kryschi C 1997 Absorption, excitation, and... 

Tietz C, Chekhlov O, Drabenstedt A, Schuster J and Wrachtrup J 1999 Spectroscopy on single light-harvesting complexes at low temperature J. Chem. Phys. B 103 6328-33... 

Domino reactions, in which a series of carefully planned reactions occurs in a single vessel, used to prepare complex biologically active organic compounds (Hall, 1994 Tietze, 1995). 

Tietze, L. F. (1995). Domino Reactions in Organic Synthesis. Chemistry dl Industry (19 June), 453-57. 

Chelerythrine, C2iHi,04N. H2O. (Items 4, 5, 6, 7, 43, 46, 60 list, p. 169). This base was isolated by Probst from the root of Chelidonium majus. It was probably first obtained in a pure state by Konig and Tietz, from the root of Sanguinaria canadensis. A process for the separation and purification of the alkaloids of Chelidonium majus roots is given by Schmidt and Selled... 

L. E. Tietze and G. Kettschau, in Stereoselective Heterocyclic Synthesis. I (P.Metz, ed.) [Topics in Current Chemistry, Vol. 189],p. 1. Springer-Verlag, Berlin, 1997. 

More recently, Tietze and Steinmetz (96SL667) used the patented polystyrene-resin methodology for for the solid-phase synthesis of a large number of diverse )3-keto esters 40a-h. These were reacted with phenylhydrazine in THF at room temperature to give hydrazones 41a-h that were then cychzed into 2-phenyl 5-substituted pyrazol-3-ones 42a-h by heating in toluene at 1(X)°C (Scheme 12). 

One year later, Tietze and co-workers (97BMC1303) presented a general and straightforward method for the synthesis of diverse polymer-bound -keto esters starting from acid chlorides and Meldrum s acid. One such resin-bound y3-keto ester, 43, was treated with hydrazine hydrate in THF to afford resin-ffee N-2-unsubstituted pyrazolone 44 in 84% yield (Scheme 13). In the same paper, the synthesis of a large number of 4,5-disubstituted 2-phenyl-2,4-dihydro-37/-pyrazol-3-ones was reported. 

BMC1303 L. F. Tietze, A. Steinrrretz, and F. Balkenhohl, Bioorg. Med. Chem. Lett. 

Tietze et al. investigated the Diels-Alder reaction between 44 and 2-methylbut-2-ene at the B3-LYP/6-31G level (Scheme 30) [98EJ02733]. 

The inverse electron-demand catalytic enantioselective cycloaddition reaction has not been investigated to any great extent. Tietze et al. published the first example of this class of reaction in 1992 - an intramolecular cycloaddition of heterodiene 42 catalyzed by a diacetone glucose derived-titanium(IV) Lewis acid 44 to give the cis product 43 in good yield and up to 88% ee (Scheme 4.31) [46]. 

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