Heteroaromatic Synthesis <i>via</i> Olefin Cross-Metathesis: Entry to Polysubstituted Pyridines
作者:Timothy J. Donohoe、José A. Basutto、John F. Bower、Akshat Rathi
DOI:10.1021/ol103088r
日期:2011.3.4
The olefin cross-metathesis reaction provides a rapid and efficient method for the synthesis of α,β-unsaturated 1,5-dicarbonyl derivatives which then serve as effective precursors to mono−tetrasubstituted pyridines. Manipulation of the key 1,5-dicarbonyl intermediate allows access to pyridines with a wide range of substitution patterns. An extension of this methodology facilitates the preparation of
Ketone Synthesis under Neutral Conditions. Cu(I) Diphenylphosphinate-Mediated, Palladium-Catalyzed Coupling of Thiol Esters and Organostannanes
作者:Rüdiger Wittenberg、Jiri Srogl、Masahiro Egi、Lanny S. Liebeskind
DOI:10.1021/ol034962x
日期:2003.8.1
[reaction: see text] A versatile approach to ketone synthesis is described. The reaction relies on the palladium-catalyzed, copper diphenylphosphinate-mediated coupling of thiol esters with organostannanes under neutral reaction conditions. This reaction complements the previously described coupling of thiol esters with boronic acids that used dual thiophilic-borophilic activation methodology.
Ruthenium-Catalyzed Direct Transformation of Alkenyl Oximes to 5-Cyanated Isoxazolines: A Cascade Approach Based on Non-Stabilized Radical Intermediate
A convenient method offers an easy access to 5‐cyanated isoxazolines in good to high yields and shows good functional group tolerance and high efficiency. In this protocol, tert‐butyl nitrte plays a dual role, acting as an oxidant as well as a nitrogen source. Remarkably, this new reaction avoids using any toxic radical initiator or cyanide reagents and constructs C–O and C≡N triple bonds in a single‐step
Alkylation of acid chlorides by alkylrhodium(I) complexes
作者:L. S. Hegedus、P. M. Kendall、S. M. Lo、J. R. Sheats
DOI:10.1021/ja00852a020
日期:1975.9
Long-chain alkyl-substituted 1,10-phenanthrolines as surfactant ligands for transition-metal ions. 1. Synthesis of 4- and 4,7-undecyl-substituted 1,10-phenanthrolines