Diastereoselective synthesis of 2-substituted-piperidin-4-ones as convenient precursors for an asymmetric approach to carbacephams
作者:Achille Barco、Nikla Baricordi、Simonetta Benetti、Gisella Biondini、Carmela De Risi、Gian Piero Pollini
DOI:10.1016/j.tet.2003.08.060
日期:2003.10
Optically active carbacephams can be efficiently prepared generating the β-lactam ring on 2-substituted-piperidin-4-ones. These can, in turn, be prepared diastereoselectively through a Michael–Michael reaction sequence initiated by benzylamine on precursors derived by Wittig reaction between serinals and 4-[(4-methylphenyl)sulfonyl]-1-(triphenylphosphoranylidene)-2-butanone.
可以有效地制备旋光的咔唑,在2-取代的哌啶-4-酮上生成β-内酰胺环。这些反过来又可以通过迈克尔-迈克尔反应序列非对映选择性地制备,该反应由苄胺在丝氨酸和4-[((4-甲基苯基)磺酰基] -1-(三苯基膦基亚基)-2-丁酮之间的维蒂希反应衍生的前体上引发。