Abstract
Reactions of chloroacetamides (5) with N,N‐dimethylformamide dimethyl acetal gave 1,4‐diaryl‐piperazine‐2,5‐diones 11a–e in good yield, rather than 1,5‐diaryl‐3,7‐dimethoxy‐1H,5H‐[1,5]diazocine‐2,6‐diones (9a–e).
Acknowledgment
The authors thank Dr. Basil Wakefield for advice on preparing this article.
Notes
Dedicated to Dr. Basil J. Wakefield on the occasion of his 73rd birthday.