Route Evaluation and Ritter Reaction Based Synthesis of Oxazoline Acaricide Candidates FET-II-L and NK-12
摘要:
Clean synthetic processes are essential for industrial production of bioactive molecules. In this study, we explored several routes for the synthesis of acaricide candidates FET-II-L and NK-12 with the goal of developing a rapid route that is suitable for industrial production. Our results led us to adopt a Ritter reaction based aminohalogenation strategy that features fewer steps, simpler operation, and greatly increased overall yields relative to those of previously reported syntheses. After further optimization, the route reported herein is likely to be applicable for large scale production of these molecules.
propargyl alcohols has been successfully developed. A tandem nucleophilic ring-opening of aziridine/6-exo-dig cyclization/double bond isomerization sequence was achieved by using a single gold(I) catalyst under mild conditions. The gold(I) catalyst served as a π acid and also a σ acid to realize the dual activation of both reactants in this reaction. The obtained unsaturated morpholine products could
Stereospecific Cu-catalyzed nucleophilic ringopening of N-sulfonylaziridines with propargylamines and subsequent hydroamination afford piperazines, which leads to double-bond isomerization to furnish tetrahydropyrazines. Optically active aziridines can be cross-coupled with high enantiomeric purities (>98% ee).
Cp*Co(III)-Catalyzed C-7 C–C Coupling of Indolines with Aziridines: Merging C–H Activation and Ring Opening
作者:Pinaki Bhusan De、Sayan Atta、Sourav Pradhan、Sonbidya Banerjee、Tariq A. Shah、Tharmalingam Punniyamurthy
DOI:10.1021/acs.joc.0c00010
日期:2020.4.3
A Cp*Co(III)-catalyzed directing group-assisted C7C–C coupling of indolines with aziridines has been developed by merging C–Hactivation and ring opening. The use of cobalt catalyst, detection of a Co(III) intermediate, and late-stage removal of the directing group are important practical features.
A domino Bi‐catalysedC−N/C−S bondformation of N‐sulfonylaziridines is developed with 1,4‐dithiane‐2,5‐diol to give 3,4‐dihydro‐1,4‐thiazines at room temperature. The use of Bi(OTf)3 as a catalyst, atom economy and regioselectivity are the important practical features.
A process for aziridination of olefins using NaIO4/alkali metal bromide/H
+
/Chloramine-T combination in presence of dipolar aprotic solvent under ambient conditions to obtain aziridines is disclosed.