1997 oxirane derivatives

oxirane derivativesR 0030

10 - 098Highly Enantioselective Epoxidation of trans-Stilbenes Catalyzed byChiral Ketones. — A series of novel chiral ketones such as (I) (8 examples)are investigated as catalysts for the epoxidation of trans-stilbenes. They givethe highest enantioselectivities reported to date. By increasing the stericbulkiness at the 3 and 3’ positions in the catalyst the resulting chiral ketonesgive better enantioselectivity than ketone ( Ia). — (YANG, D.; WANG, X.-C.;WONG, M.-K.; YIP, Y.-C.; TANG, M.-W.; J. Am. Chem. Soc. 118 (1996) 45,11311-11312; Dep. Chem., Univ. Hong Kong, Hong Kong; EN)

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