Synthesis of 3-(Phosphorylmethyl)cycloalkenones by Forced Conjugate Addition of α-Phosphonate Carbanions to Cyclic Enones
作者:Marian Mikolajczyk、Wieslawa Perlikowska
DOI:10.1055/s-2007-965982
日期:2007.4
group giving 1,2-adducts. When complexes of cycloalkenones with aluminum tris(2,6-diphenylphenoxide) were used for this reaction, regioselective 1,4-addition was observed. Upon oxidation the thus-formed 1,4-adducts gave the corresponding 3-(phosphorylmethyl)cycloalk-2-enones. An alternative approach to the latter compounds involved 1,4-addition of diethyl lithiomethylphosphonate to 2-sulfinylcycloalk-2-enones
发现环烯酮与 α-锂化二乙基(苯基硒基)甲基膦酸酯优先或仅在羰基处反应,产生 1,2-加合物。当环烯酮与三(2,6-二苯基苯氧基)铝的配合物用于该反应时,观察到区域选择性1,4-加成。如此形成的1,4-加合物在氧化后得到相应的3-(磷酰基甲基)环烷-2-烯酮。后一种化合物的另一种方法涉及将锂硫甲基膦酸二乙酯 1,4-加成到 2-亚磺酰基环烷-2-烯酮上,然后消除亚砜。