Stereoselective synthesis of hydrazinodihydrofurans <i>via</i> cascade Michael addition–substitution involving the reaction of curcumin and other β-dicarbonyls with α-hydrazinonitroalkenes
作者:Kalisankar Bera、Narasimham Ayyagari、Nishikant Satam、Irishi N. N. Namboothiri
DOI:10.1039/c9ob01974j
日期:——
Highly diastereoselective synthesis of 2-hydrazinated 2,3-dihydrofurans in good to excellent yields involving an interrupted Feist–Bénary type reaction by treating a wide variety of 1,3-dicarbonyl compounds, including curcumins, with α-hydrazinated nitroalkenes is reported here. The first ever enantioselective reaction of α-hydrazinonitroalkenes has also been carried out with two selected 1,3-dicarbonyls
据报道,通过α-肼化硝基烯烃处理各种1,3-二羰基化合物(包括姜黄素),可以中断Feist-Bénary型反应,以高至极好的产率对2-肼化2,3-二氢呋喃进行高度非对映选择性合成。α-hydrazinonitroalkenes有史以来的第一次对映体选择性反应也已通过采用具有两个选择的1,3-二羰基,双甲酮和环己酮进行大号-吨-亮氨酸squaramide衍生作为手性有机催化剂,得到对映富集的2- hydrazinodihydrofurans作为单一的非对映异构体,具有良好的收率和良好的对映选择性。