在terminal催化剂的存在下,用末端炔烃处理β-酮膦酸酯(Horner–Wadsworth–Emmons试剂),得到2 H -1,2-氧代磷酰2-氧化物,具有多种取代方式。该反应通过两个连续的过程进行:β-酮膦酸酯的碳-碳σ键裂解,并以区域和立体选择性方式插入炔烃,然后环化所得的不饱和δ-膦酰基α,β酮产生2 H -1,2-氧杂磷酰化2-氧化物。人们发现在中性条件下,霍纳-沃兹沃思-埃蒙斯试剂会添加到非极性不饱和化合物中。
Rhenium-Catalyzed Synthesis of 2<i>H</i>-1,2-Oxaphosphorin 2-Oxides via the Regio- and Stereoselective Addition Reaction of β-Keto Phosphonates with Alkynes
(Horner–Wadsworth–Emmons reagents) with terminal alkynes in the presence of a rhenium catalyst gave 2H-1,2-oxaphosphorin 2-oxides with various substitution patterns. The reaction proceeds via two consecutive processes: cleavage of a carbon–carbonσ-bond of the β-keto phosphonate with insertion of the alkyne in a regio- and stereoselective manner, followed by cyclization of the resulting δ-phosphonyl α,β-unsaturated
在terminal催化剂的存在下,用末端炔烃处理β-酮膦酸酯(Horner–Wadsworth–Emmons试剂),得到2 H -1,2-氧代磷酰2-氧化物,具有多种取代方式。该反应通过两个连续的过程进行:β-酮膦酸酯的碳-碳σ键裂解,并以区域和立体选择性方式插入炔烃,然后环化所得的不饱和δ-膦酰基α,β酮产生2 H -1,2-氧杂磷酰化2-氧化物。人们发现在中性条件下,霍纳-沃兹沃思-埃蒙斯试剂会添加到非极性不饱和化合物中。