2 -Pyridone, 6-ethoxy-4,5-dihydro

H)-Pyridone, 6-ethoxy-4,5-dihydro- (8) 2(3H)-Pyridinone, 6-ethoxy-4,5-dihydro- (9) (41879-47-4)... 

The procedure described here for the preparation of succinimide silver salt is a modification of one reported for the formation of the silver derivative of maleimide. The alkylation step is modeled after the procedure of Comstock and Wheeler/ who prepared 2-ethoxypyrrolin-5-one in unspecified 3deld, and is an improvement over a later procedure developed in the laboratories of the submitters/ The general scheme has been successfully applied to the preparation of a variety of 2-ethoxypyrrolin-5-ones (Table 1) as well as 6-ethoxy- and 6-propoxy-4,5-dihydro-2(3H)-pyridone from the corresponding five- and six-membered cyclic imides/... 

Irradiation of a tert-butyl alcohol solution of 6-ethoxy-4,5-dihydro-2(3H> pyridone (14) under conditions similar to those described for 12 gives two products, tert-butyl N-(ethoxyethylidene)carbamate (27) in 15% yield and glutarimide in 23% yield18. There is no indication of formation of the cyclobutyl analogue of 13. In aprotic solvent, ethoxyvinyl isocyanate (28) and glutarimide (29) are the major photoproducts formed. The gaseous byproducts from the irradiation of 6-propoxy-... 

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