摘要 AK 2 S 2 O 8据报道在吲哚的C-3位上α-酰胺基砜被α-活化的区域选择性烷基化。本文开发的方案通过使用路易斯酸,粘土和树脂作为吲哚与α-酰胺基砜的吲哚的Friedel-Crafts型烷基化的催化剂,提供了一种替代先前方法的新策略。形成的产物带有通用的可转化砜基和氨基。该反应条件可耐受多种底物,包括一系列在不同位置具有吸电子基团和给电子基团的吲哚。而且,各种α-取代的苯酰胺基砜和一些α-脂族酰胺基砜也以适中的产率得到所需的产物。此外,进行了初步的机理研究,并讨论了可能的反应机理。 AK 2 S 2 O 8据报道在吲哚的C-3位上α-酰胺基砜被α-活化的区域选择性烷基化。本文开发的方案通过使用路易斯酸,粘土和树脂作为吲哚与α-酰胺基砜的吲哚的Friedel-Crafts型烷基化的催化剂,提供了一种替代先前方法的新策略。形成的产物带有通用的可转化砜基和氨基。该反应条件可耐受多种底
A highly enantioselective 1,2-aza-Friedel–Crafts reaction of N-tert-butyldimethylsilylindole with N-tert-butoxycarbonyl aromatic imines is demonstrated using a BINOL-derived monophosphoric acid catalyst. The present approach provides efficient access to 3-indolylmethaneamines with aryl substituents in excellent enantioselectivities (up to 98 % ee). An inversion in the sense of enantioselection was
Controlling Regioselectivity in the Enantioselective N‐Alkylation of Indole Analogues Catalyzed by Dinuclear Zinc‐ProPhenol
作者:Barry M. Trost、Elumalai Gnanamani、Chao‐I (Joey) Hung
DOI:10.1002/anie.201705315
日期:2017.8.21
enantioselective N‐alkylation of indole and its derivatives with aldimines is efficiently catalyzed by a zinc‐ProPhenol dinuclear complex under mild conditions to afford N‐alkylated indole derivatives in good yield (up to 86 %) and excellent enantiomeric ratio (up to 99.5:0.5 e.r.). This method tolerates a wide array of indoles, as well as pyrrole and carbazole, to afford the corresponding N‐alkylation products
Catalytic Asymmetric Synthesis of 3-Indolyl Methanamines Using Unprotected Indoles and N-Boc Imines under Basic Conditions
作者:Takayoshi Arai、Junki Kakino
DOI:10.1002/anie.201607679
日期:2016.12.5
NCN/Pd‐OTf catalyst (C4) promoted the nucleophilic addition of unprotected indoles to N‐Boc imines. Using sulfinyl amines as the N‐Boc imine precursors, the combined use of C4 with K2CO3 activated the NH indoles to give chiral 3‐indolyl methanamines with up to 98 % ee. Compared with conventional acid‐catalyzed Friedel–Crafts reactions, this reaction proceeds under mildly basicconditions and is advantageous
含手性咪唑烷的NCN / Pd-OTf催化剂(C4)促进了未保护的吲哚向N-Boc亚胺的亲核加成。使用亚磺胺作为N-Boc亚胺的前体,将C4与K 2 CO 3结合使用可激活NH吲哚,从而得到手性3-吲哚甲烷甲胺,ee最高可达98%。与常规的酸催化的Friedel-Crafts反应相比,该反应在温和的碱性条件下进行,有利于酸敏感的底物的使用。
NIS-Assisted Aza-Friedel-Crafts Reaction with α-Carbamoysulfides as Precursors of<i>N</i>-Carbamoylimines
AbstractA general and practical N‐iodosuccinimide (NIS)‐promoted aza‐Friedel–Crafts reaction of various aromatic nucleophiles with N‐acylimines generated in situ from α‐amidosulfides to give a rapid access to highly functionalized amines is described. The newly developed methodology is very mild, fast, efficient, and complementary.