Stereoselective 1,3-Dipolar Cycloadditio
β
Marko Ε kof; Jurij Svete; Branko Stanovnik; Ljubo GoliΔ; Simona GoliΔ-Grdadolnik;
π
Article
π
1998
π
John Wiley and Sons
π
German
β 178 KB
Benzoyl-3-[(E)-cyanomethylidene]-5-(methoxycarbonyl)pyrrolidin-2-one (5) was prepared in four steps from l-pyroglutamic acid (1). 1,3-Dipolar cycloadditions of diazomethane ( 6) and 2,4,6-trimethoxybenzonitrile oxide (7) gave substituted 1,2,7-triazaspiro[4.4]non-1-en-6-one 12 and 1-oxa-2,7-diazaspi