Chemoselectivity in the rhodium(II) acetate catalysed decomposition of α-diazo-β-keto-γ,δ-alkenyl-δ-aryl compounds: Aromatic C-H insertion reaction or wolff rearrangement-electrocyclization
作者:Didier Collomb、Bernard Chantegrel、Christian Deshayes
DOI:10.1016/0040-4020(96)00581-9
日期:1996.7
The rhodium(II) acetate catalysed decomposition of α-diazo-β-keto-γ,δ-alkenyl phosphonates 1 substituted in the δ-position by an aryl group gave rise to mixtures of isomeric hydroxynaphthalenephosphonates, 3 resulting from a Wolff rearrangement-electrocyclization process and 5 resulting from an aromatic C-H insertion reaction. The 3:5 ratio was found to depend on the substitution pattern of the γ,δ-double
铑(II),乙酸催化的α重氮基β酮γ,δ链烯基膦酸酯的分解1被芳基在δ位取代产生了异构体hydroxynaphthalenephosphonates的混合物,3从沃尔夫重排electrocyclization所得和5是由芳族CH插入反应产生的。在3:5的比例被发现依赖于γ,δ-双键的取代方式。重氮膦酸酯1的类似物重氮酯9表现出相似的行为。特别是乙酸铑(II)催化2-重氮-5,5-二苯基-3-氧opent-4-烯酸酯9c的分解如先前报道的那样,生成1-羟基-4-苯基-2-萘甲酸乙酯11c,而不生成2-羟基-4-苯基-1-萘甲酸乙酯10c。通过X射线晶体学确认了11c的结构。