Intramolecular cyclopropanation reactions en route to novel P-heterocycles
摘要:
The first examples of intramolecular cyclopropanation reactions on a phosphonate template catalyzed by Rh-2(OAc)(4) are described. These reactions proceed in excellent yield and give mixtures of the P-heterocycles cis-2a-d and trans-2a-d with moderate levels of diastereoselectivity. The diastereoselectivity of this transformation is dependent upon the size of the alkyl group R contained in the alkyl alpha-diazodiallylphosphonoacetate starting materials 1a-d. (C) 1999 Elsevier Science Ltd. All rights reserved.
Intramolecular cyclopropanation reactions en route to novel P-heterocycles
摘要:
The first examples of intramolecular cyclopropanation reactions on a phosphonate template catalyzed by Rh-2(OAc)(4) are described. These reactions proceed in excellent yield and give mixtures of the P-heterocycles cis-2a-d and trans-2a-d with moderate levels of diastereoselectivity. The diastereoselectivity of this transformation is dependent upon the size of the alkyl group R contained in the alkyl alpha-diazodiallylphosphonoacetate starting materials 1a-d. (C) 1999 Elsevier Science Ltd. All rights reserved.