Highly stereoselective hetero Diels-Alder reactions of chiral 3-(p-tolylsulfinyl)-2-furaldehyde with Danishefsky's diene promoted by a lanthanoid Lewis acid
作者:Yoshitsugu Arai、Tsutomu Masuda、Yukio Masaki、Motoo Shiro
DOI:10.1016/0957-4166(96)00126-7
日期:1996.4
Hetero Diels-Alder reactions of optically active 3-(p-tolylsulfinyl)-2-furaldehyde with 1-methoxy-3-(trimethylsilyloxy)-buta-1,3-diene (Danishefsky's diene) in the presence of a Lewis acid has been examined. The reaction in the presence of 1.0 equiv. of Ln(OTf)3 (Ln = Yb, Nd and Sm) followed by acidic work-up produced in good yields (68–88%) the hetero Diels-Alder adduct with high diastereoisomeric
在路易斯酸的存在下,光学活性的3-(对甲苯甲磺酰基)-2-糠醛与1-甲氧基-3-(三甲基甲硅烷基氧基)-丁-1,3-二烯(Danishefsky's二烯)的杂Diels-Alder反应已经完成检查。反应在1.0当量存在下进行。Ln(OTf)3(Ln = Yb,Nd和Sm),然后进行酸性处理,以高产率(68-88%)产生具有高非对映异构体过量度(93-98%de's)的杂Diels-Alder加合物在NMR位移试剂的存在下,三(2,2,6,6-四甲基-3,5-庚二酮酸酯)[[Eu(thd)3 ]以适当的收率获得了相应的非对映异构体作为主要加合物,收率为77%德