Riehs G, Urban E. EPC Synthesis of (+)-Heptelidic Acid. Monatshefte fur Chemie. 1997;128(3):281-289. doi: 10.1007/BF00807894

Riehs G, Urban E, Völlenkle H. A key step towards EPC synthesis of (+)-heptelidic acid. Tetrahedron. 1996 Jun;52(26):8725-8732. doi: 10.1016/0040-4020(96)00428-0

Fleischhacker W, Lauritz S, Urban E, Baumann P, Bittiger H. Activity of 2-azaspiro[4.5]decane-6-carboxylates as GABA-uptake inhibitors. Archiv der Pharmazie. 1996 Mar;329(3):149-154. doi: 10.1002/ardp.19963290307

Urban E, Knühl G, Helmchen G. Enantiomerically pure 5-substituted 2-oxo-cyclopentanecarboxylates by conjugate addition of cuprates to asymmetric shielded 2-oxo-cyclopentenecarboxylates. Tetrahedron. 1996 Jan 15;52(3):971-986. doi: 10.1016/0040-4020(95)00951-5

Riehs G, Urban E. Asymmetric protected 2-oxo-5-isopropyl-cyclohexenecarboxylates as key intermediates towards an EPC synthesis of (+)-heptelidic acid. Tetrahedron. 1996 Jan;52(4):1221-1230. doi: 10.1016/0040-4020(95)00952-3

Urban E, Knühl G, Helmchen G. A short synthesis of (-)-chokol A. Tetrahedron. 1995 Nov 20;51(47):13031-13038. doi: 10.1016/0040-4020(95)00834-U

Hollauf G, Urban E. Synthesis of potential antimicrobial oxiranylisobenzofuranones. Monatshefte für Chemie Chemical Monthly. 1995 Nov;126(11):1203-1212. doi: 10.1007/BF00824298

Urban E, Richs G, Knühl G. Enantiomerically Pure 6-Substituted 2-Oxo-cyclohexanecarboxylates by Conjugate Addition of Cuprates to Asymmetric Shielded 2-Oxo-cyclohexenecarboxylates. Tetrahedron. 1995 Oct 9;51(41):11149-11164. doi: 10.1016/0040-4020(95)00676-Y

Riehs G, Urban E. Asymmetric protected enoates as key intermediates towards an EPC synthesis of (+)-heptelidic acid. Tetrahedron Letters. 1995 Oct 2;36(40):7233-7234. doi: 10.1016/0040-4039(95)01538-S

Urban E, Knühl G, Helmchen G. EPC synthesis of 5-substituted 2-oxo-cyclopentanecarboxylates via conjugate addition of cuprates to asymmetric shielded 2-oxo-cyclopentenecarboxylates. Tetrahedron Letters. 1995 Oct 2;36(40):7229-7232. doi: 10.1016/0040-4039(95)01537-R

Urban E, Riehs G, Knühl G. EPC synthesis of 6-substituted 2-oxo-cyclohexanecarboxylates via conjugate addition of cuprates to asymmetric shielded 2-oxo-cyclohexenecarboxylates. Tetrahedron Letters. 1995 Jul 3;36(27):4773-4776. doi: 10.1016/00404-0399(50)0886H-

Fleischhacker W, Lauritz S, Urban E, Baumann P, Bittiger H. Synthesis and biochemical studies of spirocyclic amino acids. II. Activity of 2-azaspiro[5.5]undecane-7-carboxylates as GABA-uptake inhibitors. European Journal of Medicinal Chemistry. 1995;30(9):707-713. doi: 10.1016/0223-5234(96)88288-2

Hollauf G, Urban E. Synthesis of GABA-analogous spirocyclic amino acids, 4. N-benzyl-2-azaspiro[4.4]nonane-6-carboxylates. Heterocycles. 1994 Oct 1;38(10):2295-2308. doi: 10.3987/com-94-6840

Jager W, Hofeneder M, Urban E, Koch HP. ZYTOTOXISCHE AKTIVITAT NEUER CYCLISCHER LACTONE IM 'HEFE-TEST'. Pharmazie. 1993;48(7):553-554.

Edelsbacher A, Urban E, Weidenauer W. Preparation of enantiomerically pure 5,6-dihydroxy-isobenzofuranones and 5,6-dihydroxy-4,7-methano-isobenzofuranones. Monatshefte für Chemie Chemical Monthly. 1992 Aug;123(8-9):741-747. doi: 10.1007/BF00812323

Dostal C, Lauritz S, Urban E. Synthesis and rearrangement of aminoalkyl lactones to spirocyclic hydroxymethyl lactams. Heterocycles. 1992 Jan 1;34(1):135-148. doi: 10.3987/com-91-5906

Aufreiter U, Fuchs M, Urban E. Synthese von 5,6‐Dihydroxy‐4,7‐methano‐isobenzofuranonen. Archiv der Pharmazie. 1992;325(9):579-584. doi: 10.1002/ardp.19923250910

Rachenzentner A, Urban E. Synthese von 5,6‐Dihydroxy‐tetrahydro‐isobenzofuranonen. Angela Rachenzentner und Ernst Urban. Archiv der Pharmazie. 1992;325(2):101-105. doi: 10.1002/ardp.19923250209

Nour RA, Schneider K, Urban E. Synthesis of 4,7‐Dihydroxyperhydroisobenzofuran‐1‐one and Comparison with Zwergal's Structure of “garlicin”. Liebigs Annalen der Chemie. 1992;1992(4):383-386. doi: 10.1002/jlac.199219920167

Stejskal R, Urban E, Völlenkle H. Synthese und Konfigurationszuordnung von potentiell antimikrobiellen 5,6-Dihydroxyisobenzofuranonen. Monatshefte für Chemie Chemical Monthly. 1991 Mar;122(3):145-156. doi: 10.1007/BF00809359