期刊
ADVANCED SYNTHESIS & CATALYSIS
卷 351, 期 7-8, 页码 999-1004出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adsc.200800804
关键词
cyclopropanation; diazomethane; palladium; singlet oxygen; stereoselectivity
资金
- National Institutes of Heatlh
- MBRS-SCORE Program-NIGMS [GM52588]
- National Science Foundation [DBI-0521342, DUE-9451624]
Unsaturated bicyclic endoperoxides are efficiently cyclopropanated with excess diazomethane in the presence of catalytic palladium(II) acetate [Pd(OAc)(2)] in a stereoselective manner. This method represents a new peroxide-preserving transformation. Whereas the unsaturated endoperoxides in the [2.2.1]series are attacked by the carbene from the exo face, the analogs with larger bridges are preferentially attacked from the face syn to the peroxo bridge. Only in the case of the benzannelated [2.2.2]system does the attack occur exclusively from the face proximal to the benzene ring. Certain strained cyclopropanated endoperoxides are reduced by diazomethane to give cis-diols. 2-Methylfuran endoperoxide gives rise to cis-1-formyl-2-acetylcyclopropane in excellent yield.
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