Citation: Hong Bin SUN, Wei Yi HUA, Si Xun PENG. ASYMMETRIC EPOXIDATION OF CHROMENE DERIVATIVES WITH HYDROGEN PEROXIDE CATALYZED BY OPTICALLY ACTIVE Mn (Ⅲ) SALEN COMPLEX[J]. Chinese Chemical Letters, ;1995, 6(11): 927-930. shu

ASYMMETRIC EPOXIDATION OF CHROMENE DERIVATIVES WITH HYDROGEN PEROXIDE CATALYZED BY OPTICALLY ACTIVE Mn (Ⅲ) SALEN COMPLEX

Devision of Medicinal Chemistry, China Pharmaceutical University, Nanjing 210009

Received Date: 7 April 1995

Fund Project: We wish to thank Miss Ling Chen and Miss Zheng Yan for helpful supports.

A highly practical asymmetric epoxidation procedure for the synthesis of optically pure epoxychromans has been developed which employs 30% hydrogen peroxied as the oxidant and the Jacobsen-catalyst as the catalyst.The presence of imidazole has a significant effect on epoxidation rates and total turnovers.A variety of chromene derivatives were converted into corresponding epoxides of 89~100% ee in 72~92% isolated yields.
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