反应详情

A mixture of intermediate (10) (0.072 mol) in DME (300 ml) was cooled on an ice bath. 2-methyl-2-propanol, potassium salt (0.144 mol) was added portionwise. The mixture was stirred at a low temperature for 30 min, at room temperature for 30 min, hydrolyzed and acidified with HCl. The precipitate was filtered off, rinced and dried, yielding 17 g (51.8%) of 5-(3-chlorophenyl)-7-[2-(4-chlorophenyl)-1,3-dioxolan-2-yl]-1,5-dihydro-4,1-benzoxazepin-2(3H)-one (intermediate 11), mp. 205° C.

1. temperaturewas cooled on an ice bath
2. filtrationThe precipitate was filtered off
3. customdried