描述了基于两个连续的分子间周环反应的操作简单的一锅,三组分,非对映选择性合成饱和咔唑和相关哒嗪并[3,4- b ]吲哚的方法。反应序列涉及3-乙烯基-1 H-吲哚的分子间Diels-Alder(D-A)反应,其中含有吸电子的N-保护基团和合适的亲二烯体。由于N保护基的吸电子特性,所得的D–A环加合物具有足够的稳定性,可在随后的原位非对映特异性分子间烯键反应下与添加的亲烯基团发生反应,从而生成相对立体控制最多为4的官能化咔唑立体中心。
Asymmetric Organocatalytic Synthesis of Bisindoles - Scope and Derivatizations
作者:Christina Retich、Stefan Bräse
DOI:10.1002/ejoc.201701502
日期:2018.1.10
library of various novel biologically active bisindoles with different substitution patterns was synthesized. Electro‐withdrawing groups on the starting material led to the formation of Povarov‐type structures. Furthermore we could successfully demonstrate that consecutive reactions like cross couplings, reductions or even click reactions on bisindoles are feasible.
Asymmetric Diels-Alder Reactions of Vinylindoles Using Organocatalysis
作者:Luca Bernardi、Alfredo Ricci、Claudio Gioia
DOI:10.1055/s-0029-1217046
日期:2010.1
The different behavior of 3- and 2-vinylindoles in Diels-Alder cycloaddition reactions in the presence of bifunctional hydrogen bond donor organocatalysts is described. asymmetric catalysis - Diels-Alderreactions - kinetic resolution - organocatalysis - vinylindoles
An asymmetric aza‐Diels–Alder reaction of 3‐vinylindoles with isatin‐derived ketimines has been developed. A series of spiroindolone derivatives were thus obtained in good to excellent yields with excellent enantioselectivity (up to 96 % yield and 99 % ee). Furthermore, the antimalarial compound NITD609 could be obtained in three steps with an overall yield of 40.6 %. Control experiments and operando
Organocatalytic Asymmetric Synthesis of Tetracyclic Pyridocarbazole Derivatives by Using a Diels-Alder/aza-Michael/Aldol Condensation Domino Reaction
作者:Dieter Enders、Céline Joie、Kristina Deckers
DOI:10.1002/chem.201302127
日期:2013.8.12
Triple domino: An organocatalyticasymmetric triple cascade reaction to form tetracyclic pyridocarbazole derivatives is described. The new protocol includes a Diels–Alder/aza‐Michael/aldol condensation sequence. Up to six stereogenic centers are formed with excellent diastereo‐ and enantioselectivity. IM = iminium activation; EN = enamine activation.