abstract |
(57) [Summary] [Object] The present invention provides a method capable of producing a 2-exomethylene penum derivative by a simple operation, an industrially advantageous method, and a high yield and a high purity. The purpose is to ## STR1 ## The method of the present invention has the general formula: An allenyl β-lactam compound represented by the formula: Is a method for obtaining a 2-exomethylene penum derivative represented by |