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2005
Antibiotics
U 1200
01- 194
A Novel, Mild, and Facile Method to Prepare 6-Methylidene Penem Derivatives.
— It is found that the stable penem (I) smoothly and effectively undergoes aldol reaction in the presence of MgBr2/NEt3. In most cases, it proceeds with high stereoselectivity and no racemization at C5 takes place. Treatment of the acetylated products with
activated Zn under neutral conditions provides a novel and mild approach to 6-methylidene penem derivatives. — (ABE*, T.; et al.; J. Org. Chem. 69 (2004) 18,
5850-5860; Med. Res. Lab., Wyeth Lederle Japan, Ltd., Shiki, Saitama 353, Japan;
Eng.) — Jannicke
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