Chin. J. Org. Chem. ›› 2006, Vol. 26 ›› Issue (03): 379-382. Previous Articles     Next Articles

Reports

烯丙位和高烯丙位酰胺基环烯烃环氧化的非对映选择性

黄莉,周亚菊,叶德泳*   

  1. (复旦大学药学院 上海 200032)
  • 收稿日期:2005-04-14 修回日期:2005-09-14 发布日期:2006-02-28
  • 通讯作者: 叶德泳

Diastereoselectivity in Epoxidation of Allylic and Homoallylic Amidocycloalkenes of Varied Size

HUANG Li,ZHOU Ya-Ju,YE De-Yong*   

  1. Department of Medicinal Chemistry, School of Pharmacy, Fudan University, Shanghai 200032)
  • Received:2005-04-14 Revised:2005-09-14 Published:2006-02-28
  • Contact: YE De-Yong

Epoxidation of allylic amidocycloalkenes of five to seven membered rings consistently showed qualified syn-stereoselectivity. However, the cis-selectivity of homoallylic amido cyclopentene was related to the specific amido group. Epoxidation of 4-acetamidocyclopentene furnished good diastereoselectivity comparable to that of allylic ones. But 4-benzamidocyclopentene was epoxidized to obtain a relatively poor cis-selectivity. As to the homoallylic cyclohexene series, epoxidation of 4-acetamidocyclohexene afforded the corresponding cis-epoxide, whereas 4-benzamidocyclohexene gave, besides the cis-epoxide, an unexpected product: exo-2-oxa-3-phenyl-4-azabicyclo[3.3.1]non-3-en-8-ol that might be formed from an intramolecular cyclization of the virtual trans-epoxide. The quantum calculations and the results of the epoxidation of the derivatives supported this mechanism. The highly cis-stereoselective epoxidation of the ami-docycloalkenes could be used to the synthesis of the stereodefined analogues.

Key words: diastereoselectivity, epoxidation, intramolecular cyclization