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Title
Japanese:Synthesis of substituted 6-imino-2-piperidinones by Rh-catalyzed [4+2] annulation of 4-alkynals with carbodiimides. 
English:Synthesis of substituted 6-imino-2-piperidinones by Rh-catalyzed [4+2] annulation of 4-alkynals with carbodiimides. 
Author
Japanese: Ken Tanaka, Marina Mimura, Daiki. Hojo.  
English: Ken Tanaka, Marina Mimura, Daiki. Hojo.  
Language English 
Journal/Book name
Japanese:Tetrahedron 
English:Tetrahedron 
Volume, Number, Page Vol. 65    No. 44    pp. 9008-9014
Published date 2009 
Publisher
Japanese:Elsevier Ltd. 
English:Elsevier Ltd. 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
DOI https://doi.org/10.1016/j.tet.2009.06.115
Abstract Synthesis of substituted 6-imino-2-piperidinones, e.g., I (R1 = Cy, i-Pr, p-Tol; R2 = Cy, n-Bu, Me3Si), has been achieved by cationic rhodium(I)/dppp complex-catalyzed [4+2] annulations of various 4-alkynals with carbodiimides at room temp. The reactions of benzene-linked 4-alkynals (2-alkynylbenzaldehydes) and carbodiimides also proceeded at room temp., affording the corresponding 6-imino-2-piperidinones. [on SciFinder(R)]

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