(TRans-r)-1-tert-butyl 3-methyl 4-(1-pivaloyl-2,3-dihydro-1h-pyrido[2,3-b][1,4]oxazin-6-yl)pyrrolidine-1,3-dicarboxylate 1g

(TRans-r)-1-tert-butyl 3-methyl 4-(1-pivaloyl-2,3-dihydro-1h-pyrido[2,3-b][1,4]oxazin-6-yl)pyrrolidine-1,3-dicarboxylate 1g