Regio- and π-facial selective Lewis acid interceded Diels–Alder reactions of α-dienyl-β-lactams: an indepth analysis
作者:Gaurav Bhargava、Amit Anand、Mohinder P. Mahajan、Takao Saito、Ken Sakai、Chitrani Medhi
DOI:10.1016/j.tet.2008.04.087
日期:2008.7
The regio-, diastereo-, and π-facial selective Lewis acid mediated Diels–Alder reactions of cis/trans-3-butadienyl-2-azetidinones with unsymmetrical dienophiles viz. methyl acrylate, dimethyl fumarate, and acrolein leading to the synthesis of diastereomerically pure and biologically potent 1,3,4-trisubstituted-2-azetidinones are reported. Theoretical calculations at HF/6-31G∗∗ and 6-31G∗∗/DFT levels
区域,非对映体和π界面选择性路易斯酸介导的顺/反-3-丁二烯基-2-氮杂环丁酮与不对称亲双烯体的Diels-Alder反应,即。据报道,丙烯酸甲酯,富马酸二甲酯和丙烯醛可合成非对映体纯且生物学上有效的1,3,4-三取代-2-氮杂环丁酮。为了支持观察到的π面选择性,已经进行了HF / 6-31G **和6-31G ** / DFT的理论计算。非对映体纯的“内”加合物的形成得到X射线衍射研究的支持。