Bifunctional thiosquaramide catalyzed asymmetric reduction of dihydro-β-carbolines and enantioselective synthesis of (−)-coerulescine and (−)-horsfiline by oxidative rearrangement
作者:Manda Sathish、Fabiane M. Nachtigall、Leonardo S. Santos
DOI:10.1039/d0ra07705d
日期:——
(up to 88%). Moreover, the chiral thiosquaramide used also afforded exceptional catalyst activity in the syntheses of (−)-coerulescine (5) and (−)-horsfiline (6) with excellent enantioselectivities up to 98% and 93% ee, respectively, via an enantioselective oxidativerearrangement approach.
A Highly Enantioselective Access to Tetrahydroisoquinoline and β-Carboline Alkaloids with Simple Noyori-Type Catalysts in Aqueous Media
作者:Laurent Evanno、Joel Ormala、Petriâ M. Pihko
DOI:10.1002/chem.200902289
日期:2009.12.7
enhancement: A very convenient modified protocol for the enantioselective transfer hydrogenation of dihydroisoquinoline skeletons under aqueous conditions is reported. Unmodified Noyori ligands can be used and the activity of the catalyst is greatly enhanced with silver additives (see scheme). The protocol was used in a very short synthesis of the alkaloids (S)‐harmicine and (S)‐crispine.
Insecticidal activity of indole derivatives against Plutella xylostella and selectivity to four non-target organisms
作者:Ângela C. F. Costa、Sócrates C. H. Cavalcanti、Alisson S. Santana、Ana P. S. Lima、Thaysnara B. Brito、Rafael R. B. Oliveira、Nathália A. Macêdo、Paulo F. Cristaldo、Ana Paula A. Araújo、Leandro Bacci
DOI:10.1007/s10646-019-02095-1
日期:2019.10
have resistance to a range of insecticides. Indole derivates can exert diverse biological activities, and different effects may be obtained from small differences in their molecular structures. Indole is the parent substance of a large number of synthetic and natural compounds, such as plant and animal hormones. In the present study, we evaluate the insecticidalactivity of 20 new synthesized indole
The first asymmetric transfer hydrogenation of cyclic imines and iminiums in water was successfully performed in high yields and enantioselectivities with sodium formate as the hydrogen source and CTAB as an additive catalyzed by a water-soluble and recyclable ruthenium(II) complex of the ligand (R,R)-2.
以甲酸钠为氢源,CTAB 为添加剂,在配体 (R,R)-2 的水溶性可回收钌 (II) 复合物催化下,首次成功地在水中对环状亚胺和亚胺进行了不对称转移加氢反应,并获得了较高的产率和对映选择性。
Synthesis of Spirocyclic Indolines by Interruption of the Bischler–Napieralski Reaction
作者:Jonathan William Medley、Mohammad Movassaghi
DOI:10.1021/ol401465y
日期:2013.7.19
The development of a versatile method for the synthesis of spirocyclic pyrrolidinoindolines is discussed. Treatment of N-acyltryptamines with trifluoromethanesulfonic anhydride–2-chloropyridine reagent combination affords highly persistent spiroindoleninium ions that are subject to intra- and intermolecular addition at C2 by nucleophiles.