Enantiodivergent Approach to the Synthesis of <i>Cis</i>-2,6-Disubstituted Piperidin-4-ones
作者:Alejandro Lahosa、Miguel Yus、Francisco Foubelo
DOI:10.1021/acs.joc.9b01008
日期:2019.6.7
β-amino ketone derivatives were synthesized by decarboxylative Mannich reaction of chiral N-tert-butanesulfinyl imines with β-keto acids and were subsequently transformed into cis-2,6-disubstituted piperidin-4-ones through an organocatalyzed condensation with aldehydes. Both enantiomers were accessible from the same precursors by inverting the order in the reaction sequence of the aldehydes involved
对映体纯β-氨基酮衍生物通过手性脱羧曼尼希反应合成ñ -叔-butanesulfinyl亚胺与β酮酸和随后转化成顺式通过与醛的缩合organocatalyzed -2,6-二取代哌啶-4-酮。通过颠倒参与亚胺形成和分子内曼尼希缩合反应的醛的反应顺序,可以从相同的前体获得两种对映体。哌啶生物碱(+)-241D,(-)-表嘧啶和(-)-lasubine II的合成证明了该方法的实用性。