The triplex Diels-Alder reaction: intramolecular cycloaddition of phenyl-substituted alkenes to 1,3-dienes
摘要:
The triplex Diels-Alder reaction of dienes and styrene-like dienophiles that are covalently linked with a flexible alkyl chain was investigated. Sensitization with 9,10-dicyanoanthracene in benzene solution leads to good yields of [4 + 2] adducts when the diene is a derivative of cyclohexadiene and the linking chain contains two atoms. If the linking chain contains three atoms, dyotropic transfer of hydrogens occurs. When acyclic dienes are employed, it is believed that conformational isomers lead to mixtures containing considerable yields of both [4 + 2] and [2 + 2] cycloadducts.
The triplex Diels-Alder reaction: intramolecular cycloaddition of phenyl-substituted alkenes to 1,3-dienes
摘要:
The triplex Diels-Alder reaction of dienes and styrene-like dienophiles that are covalently linked with a flexible alkyl chain was investigated. Sensitization with 9,10-dicyanoanthracene in benzene solution leads to good yields of [4 + 2] adducts when the diene is a derivative of cyclohexadiene and the linking chain contains two atoms. If the linking chain contains three atoms, dyotropic transfer of hydrogens occurs. When acyclic dienes are employed, it is believed that conformational isomers lead to mixtures containing considerable yields of both [4 + 2] and [2 + 2] cycloadducts.
The triplex Diels-Alder reaction: intramolecular cycloaddition of phenyl-substituted alkenes to 1,3-dienes
作者:Ingrid Wolfle、Samantha Chan、Gary B. Schuster
DOI:10.1021/jo00026a023
日期:1991.12
The triplex Diels-Alder reaction of dienes and styrene-like dienophiles that are covalently linked with a flexible alkyl chain was investigated. Sensitization with 9,10-dicyanoanthracene in benzene solution leads to good yields of [4 + 2] adducts when the diene is a derivative of cyclohexadiene and the linking chain contains two atoms. If the linking chain contains three atoms, dyotropic transfer of hydrogens occurs. When acyclic dienes are employed, it is believed that conformational isomers lead to mixtures containing considerable yields of both [4 + 2] and [2 + 2] cycloadducts.