Novel transformations with borontrifluoride etherate/iodide ion : facile conversion of 2-ketooxiranes and 2-bromo-2-enones to the α,β-unsaturated carbonyl compounds
Synthesis of Ketones and Esters from Heteroatom-Functionalized Alkenes by Cobalt-Mediated Hydrogen Atom Transfer
作者:Xiaoshen Ma、Seth B. Herzon
DOI:10.1021/acs.joc.6b01709
日期:2016.10.7
Cobalt bis(acetylacetonate) is shown to mediate hydrogen atom transfer to a broad range of functionalized alkenes; in situ oxidation of the resulting alkylradical intermediates, followed by hydrolysis, provides expedient access to ketones and esters. By modification of the alcohol solvent, different alkyl ester products may be obtained. The method is compatible with a number of functional groups including
(2-hydroxy)ethyl-thioureas useful as modulators of alpha2B adrenergic receptors
申请人:ALLERGAN SALES, INC.
公开号:US20020161051A1
公开(公告)日:2002-10-31
Compounds of formula (i) and of formula (ii)
1
wherein the symbols have the meaning disclosed in the specification, specifically or selectively modulate &agr;
2B
and/or &agr;
2C
adrenergic receptors in preference over &agr;
2A
adrenergic receptors, and as such are useful for alleviating chronic pain and allodynia and have no or only minimal cardivascular and/or sedatory activity.
A radical based addition–elimination route for the preparation of indoles
作者:John A. Murphy、Karen A. Scott、Rhona S. Sinclair、Concepcion Gonzalez Martin、Alan R. Kennedy、Norman Lewis
DOI:10.1039/b002565h
日期:——
Indoles, including tricyclic derivatives, are produced by cyclisations of aryl radicals onto vinyl halides followed by elimination of halide radical and tautomerism of the resulting product; the aryl radicals are produced using âclean methodologyâ either by reaction of iodide ions with arenediazonium salts or by reaction of phosphorus-centred radicals with aryl iodides.
Alkyltelluro Substitution Improves the Radical-Trapping Capacity of Aromatic Amines
作者:Jia-fei Poon、Jiajie Yan、Vijay P. Singh、Paul J. Gates、Lars Engman
DOI:10.1002/chem.201602377
日期:2016.8.26
The synthesis of a variety of aromatic amines carrying an ortho‐alkyltelluro group is described. The new antioxidants quenched lipidperoxyl radicals much more efficiently than α‐tocopherol and were regenerable by aqueous‐phase N‐acetylcysteine in a two‐phase peroxidation system. The inhibition time for diaryl amine 9 b was four‐fold longer than recorded with α‐tocopherol. Thiol consumption in the aqueous
A highly enantioselectivecyanosilylation of ketones was developed by using a chiral lithium(I) phosphoryl phenoxide aqua complex as an acid/base cooperative catalyst. The pentacoordinate silicate generated in situ from Me3SiCN/LiCN acts as an extremely reactive cyano reagent. Described is a 30 gram scale reaction and the synthesis of the key precursor to (+)‐13‐hydroxyisocyclocelabenzine.