New cationic bisoxazoline-Au(III) complex catalyzed cycloisomerization of 1-allenyl-1-ethynyl acetate.

[摘要]：Treatment of 1-allenyl-1-ethynyl acetates in the presence of a Au or Pt catalyst (5 mol%) in toluene at room temp., followed by methanolysis, gave 4-methylene-2-cyclopentenones. The new cationic bisoxazoline (box)-Au(III) complex {(S,S)-Ph-box- or [(R,R)-Bnbox AuCl2]SbF6} accelerated the reaction, providing the products in moderate yield (60-69%).

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