Synthesis of 4H-chromenes by silver (I)-catalyzed cycloaddition of ortho-quinone methides with N-allenamides

• 来源期刊: 中国科学:化学（英文版）
• 年，卷（期）: 2019,（1）
• 页码范围: 80-86
• 页数: 7页
• 语种: 英文

摘要

Chromenes represent an important class of six-membered heterocycles and have drawn tremendous attention in recent years.In this article,we report a convenient and practical synthesis of this heterocycle by a silver (I)-catalyzed cycloaddition reaction between in situ generated ortho-quinone methides and N-allenamides.Diverse 4H-chromenes were synthesized in good to excellent yields under very mild conditions.