Cycloaddition of (N-alkyl-N-phenylamino)ketene with imines
摘要:
(N-Alkyl-N-phenylamino)ketenes were prepared in the presence of various imines, and a [2 + 2] cycloaddition reaction occurred to yield 3-(N-alkyl-N-phenylamino)-2-azetidinones. The size and electronic nature of the imine substituents were varied in order to probe those factors that influence the stereochemistry of the cycloaddition. The stereochemistry of the 2-azetidinone was determined by the substitution pattern of the imines. In general, the stereochemistry of the 2-azetidinone products are significantly influenced by the bulk of the N substituent on the imine. These results are discussed in terms of a two-step zwitterionic intermediate.
Cycloaddition of (N-alkyl-N-phenylamino)ketene with imines
摘要:
(N-Alkyl-N-phenylamino)ketenes were prepared in the presence of various imines, and a [2 + 2] cycloaddition reaction occurred to yield 3-(N-alkyl-N-phenylamino)-2-azetidinones. The size and electronic nature of the imine substituents were varied in order to probe those factors that influence the stereochemistry of the cycloaddition. The stereochemistry of the 2-azetidinone was determined by the substitution pattern of the imines. In general, the stereochemistry of the 2-azetidinone products are significantly influenced by the bulk of the N substituent on the imine. These results are discussed in terms of a two-step zwitterionic intermediate.
STRODS YA. A.; LIELBRIEDIS I. EH.; NEJLAND O. YA., XIMIYA GETEROTSIKL. SOEDIN., 1977, HO 7, 977-979
作者:STRODS YA. A.、 LIELBRIEDIS I. EH.、 NEJLAND O. YA.
DOI:——
日期:——
SHARMA S. D.; KAUR S.; MEHRA USHA, INDIAN J. CHEM., 25,(1986) N 2, 141-144
作者:SHARMA S. D.、 KAUR S.、 MEHRA USHA
DOI:——
日期:——
Cycloaddition of (N-alkyl-N-phenylamino)ketene with imines
作者:William T. Brady、Mohammad M. Dad
DOI:10.1021/jo00021a029
日期:1991.10
(N-Alkyl-N-phenylamino)ketenes were prepared in the presence of various imines, and a [2 + 2] cycloaddition reaction occurred to yield 3-(N-alkyl-N-phenylamino)-2-azetidinones. The size and electronic nature of the imine substituents were varied in order to probe those factors that influence the stereochemistry of the cycloaddition. The stereochemistry of the 2-azetidinone was determined by the substitution pattern of the imines. In general, the stereochemistry of the 2-azetidinone products are significantly influenced by the bulk of the N substituent on the imine. These results are discussed in terms of a two-step zwitterionic intermediate.