Asymmetric Construction of the Azaspiro[5.6]dodec-9-ene System in Marine Natural Toxins
作者:Jun Ishihara、Mariko Horie、Yoshikatsu Shimada、Shingo Tojo、Akio Murai
DOI:10.1055/s-2002-20451
日期:——
The asymmetric formation of azaspiro[5.6]dodec-9-ene system is described. The Diels-Alder reactions of an α-methylene caprolactam and diene in the presence of a Cu(II) and (S,S)-tBu-BOX complex afford the desired spirocyclic compounds with good exo-selectivity as well as excellent enantioselectivity. These exo-adducts would be applicable to the synthesis of marine natural toxins including the corresponding cyclic imine moiety.
介绍了氮杂螺[5.6]十二-9-烯体系的不对称形成。在 Cu(II) 和 (S,S)-tBu-BOX 复合物存在下,δ-亚甲基己内酰胺和二烯的 Diels-Alder 反应产生了所需的螺环化合物,具有良好的外向选择性和优异的对映选择性。这些外加成物可用于合成海洋天然毒素,包括相应的环状亚胺分子。