Abstract
Pyridazino[1,4]oxazin‐3‐ones were conveniently prepared in a one‐pot condensation of N‐substituted 2‐chloroacetamides with various 5‐chloro‐pyridazin‐6‐ones via rearrangement of a spiro‐aminoketal intermediate.
Acknowledgment
This work was financially supported by the Korea Research Foundation (KRF‐2000‐SP0743).