intermolecular aza‐Wacker‐type reaction was developed. When a readily available olefin was treated with a nitrogen nucleophile in the presence of a Pd‐SPRIX complex and potassium persulfate, allylaminederivatives were obtained with high yield and excellent regioselectivity. The mechanistic studies showed that the reaction followed first‐order dependence on the olefin as well as palladium catalyst, but
Total Syntheses of Malabaricones B and C via a Cross-Metathesis Strategy
作者:Kshama Kundu、Sandip K. Nayak
DOI:10.1021/acs.jnatprod.6b01119
日期:2017.6.23
malabaricone C displayed various interesting biological activities, its isolation remains tedious due to its close chemical similarity to malabaricones A, B, and D. Therefore, development of an efficient synthesis route has become essential to cater to the need of large amounts of malabaricone C for its pharmacological profiling. So far there is only one report of the synthesis of malabaricone C through
Nozaki–Hiyama–Kishi reaction has been widely applied in the functionalization of carbonyl compounds with the help of Ni catalysis. Herein, a divergent regio- and stereoselective diarylation of dienes has been developed under Ni/Cr cocatalysis without the inherent driving force for the formation of polar metalalkoxides. Preliminary experimental studies have been conducted to elucidate the key roles of Ni, Cr
An organocatalytic cross-coupling of allyl bromides and arylboronicacids was developed using a designer thioether catalyst. Preliminary mechanistic studies suggested the involvement of a key sulfoxonium ylide that binds to the arylboronicacid and triggers 1,2-aryl migration.
The attempted stereoselective synthesis of chiral 2,2′-biindoline
作者:Mary J. Gresser、Steven M. Wales、Paul A. Keller
DOI:10.1016/j.tet.2010.06.035
日期:2010.8
The attempted first stereoselective synthesis of 2,2'-biindoline using a metathesis-Sharpless asymmetric dihydroxylation strategy results in the synthesis of the heterocycle in poor to modest stereoselectivity. Attempts to improve the ee by varying the heteroatom protecting groups in key intermediates did not enhance the outcome of the Sharpless AD reaction. Therefore a limitation of this AD reaction is the use of 1,4-substituted but-2-enes where these substituents are ortho-substituted aromatics. Crown Copyright (C) 2010 Published by Elsevier Ltd. All rights reserved.