Phosphine-Catalyzed [3 + 2] Cycloaddition of Sulfamate-Derived Cyclic Imines with Allenoate: Synthesis of Sulfamate-Fused Dihydropyrroles

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• 作者：Hao Yu ; Lei Zhang ; Zhilin Yang ; Zhen Li ; Yan Zhao ; Yumei Xiao ; Hongchao Guo
• 刊名：Journal of Organic Chemistry
• 出版年：2013
• 出版时间：September 6, 2013
• 年：2013
• 卷：78
• 期：17
• 页码：8427-8436
• 全文大小：453K
• 年卷期：v.78,no.17(September 6, 2013)
• ISSN：1520-6904

文摘

Ph₃P-catalyzed [3 + 2] cycloaddition reaction of sulfamate-derived cyclic imines with allenoate has been developed, affording sulfamate-fused dihydropyrroles under very mild conditions in high yields. Using amino acid-based bifunctional phosphine as chiral catalyst, its asymmetric variant provided the corresponding products in good yields with moderate to excellent enantiomeric excesses (up to 91% yield and up to 98% ee). Subsequent transformations of the heterocyclic products gave various pharmaceutically attractive compounds.