Tetrahedron

Sterochemical Studies 107 Saturated heterocycles 111: Preparation of uracils via cycloreversion of norbornenefused pyrimidinediones

G Bernáth, G Stájer, AE Szabó, Z Szóke-Molnár…

Index: Bernath, Gabor; Stajer, Geza; Szabo, Angela E.; Szoeke-Molnar, Zsolt; Sohar, Pal; et al. Tetrahedron, 1987 , vol. 43, # 8 p. 1921 - 1930

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Citation Number: 18

Abstract

From di exo-norbornane-and norbornene-azetidinones 5 and 6 with aryl isocyanates, N- arylcarbamoyl-substituted β-lactams (9 and 10) were prepared. The structures of the compounds were elucidated by IR, NMR spectroscopy and X-ray analysis, in comparison with saturated methylene-bridged quinazoline-2, 4-diones (7a-b) prepared from norbornane- diexo-β-amino acid (1) with isocyanates and PPA. When heated with PPA, compounds 9 ...