Highly diasteroselective and remarkably π-facially selective lewis acid-catalysed diels-alder cycloaddition reactions: Access to novel 1,3,4-trisubstituted 2-azetidinones

Gaurav Bhargava, Mohinder P. Mahajan, Takao Saito, Takashi Otani, Mai Kurashima, Ken Sakai

研究成果: ジャーナルへの寄稿学術誌査読

21 被引用数 (Scopus)

抄録

Diastereoselective and π-facially selective Lewis acid-catalysed intermolecular Diels-Alder reactions of 3-butadienyl-azetidin-2-ones with a variety of symmetrical dienophiles (maleic anhydride, N-phenylmaleimide, N-p-tolylmaleimide, benzoquinone and naphthoquinone) resulting in the synthesis of diastereomerically pure 1,3,4-trisubstituted 2-azetidinones are reported. The effects of different Lewis acids on the yields of the selectively formed diastereoisomers under different reaction conditions are also examined. Preferential chelation between the Lewis acid complexes of the different dienophiles and the carbonyl oxygens in the dienylazetidin-2-ones has been invoked to explain the observed π-facial selectivity. The Lewis acid complexes of the dienophiles have been shown to approach preferentially from the si-faces of the dienes, resulting in the formation of π-facially selective "endo" adducts. The structures of these "endo" adducts have even been supported by X-ray diffraction studies.

本文言語英語
ページ(範囲)2397-2405
ページ数9
ジャーナルEuropean Journal of Organic Chemistry
11
DOI
出版ステータス出版済み - 5月 30 2005
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 物理化学および理論化学
  • 有機化学

フィンガープリント

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