Within the last year
Within the past 3 years
1 - 10 of 31 articles
1,3-Stereoinduction in the addition of alkyl radicals to glyoxylic imines derived from various chiral amines has been investigated. New synthetic methodologies involving Et 3 B and Et 2 Zn as mediators have been compared. Dihydro-1,4-oxazin-2-one ( 2b ) gave the highest d.e. but no...
When carboxylic acids β-substituted by a tert -butoxy group were treated with thionyl chloride, an intermediate acyl chloride β-substituted by a hydroxyl group was likely formed. Its subsequent intramolecular cyclization produced novel β-lactones in one step. Two enantiomerically enriched...
Ortho -(2-triethoxysilylethyl) derivatives of aryl ketones undergo oxidative desilylation with H 2 O 2 . Tetralone derivatives have served as model substrates for 14-2-(triethoxysilylethyl)-7-oxopodocarpanes, which have been converted into 2-arylethanols in a four-step sequence (BH 3 ·BMS, H 2 O...
New α-phosphono-β-aryl- or β-heteroaryl-substituted α,β-unsaturated dithioesters 2 were easily prepared from diethyl phosphonodithioacetate 1 and used as thiadienes in thermal or high pressure hetero Diels–Alder cycloadditions with enol and thioenol ethers. The resulting new phosphono...
In aqueous acetonitrile with FeCl 2 or hemin/ l -cysteine, a peroxide ( 4 ) obtained from abietic acid by photosensitized air oxidation undergoes rearrangement to give a diepoxide and two spiro compounds as major products.
(2- 13 C)-Quercetin-4′- O -β-glucoside was synthesised in four steps and 28% yield from barium ( 13 C)-carbonate. This short route will be applicable to the synthesis of radiolabelled quercetin-4′- O -β- d -glucoside from barium ( 14 C)-carbonate. The most important feature is control of...
The free base 2,4-bis-(1′-dodecynyl)-deuteroporphyrin IX dioctylester, 6a , its Zn(II)complex, Zn - 6a , its Cu(II)complex, Cu - 6a , its Ni(II)complex, Ni - 6a and a number of related compounds have been prepared. The synthesis of 6a involves as key steps the palladium-catalyzed coupling of...
N -Substituted 4-methylene-2-isoxazolidinones 9a – 9e have been prepared from the tandem condensation of isocyanates 3 with α-ketol 7 . In a more polar solvent (DMF) the same reaction led to stereoisomeric alcohols 11 and 12 , which could be transformed to the thermodynamically more stable...
Read and print from thousands of top scholarly journals.
Sign up with Facebook
Sign up with Google
Already have an account? Log in
Save this article to read later. You can see your Read Later on your DeepDyve homepage.
To save an article, log in first, or sign up for a DeepDyve account if you don’t already have one.
Sign Up Log In
To subscribe to email alerts, please log in first, or sign up for a DeepDyve account if you don’t already have one.
To get new article updates from a journal on your personalized homepage, please log in first, or sign up for a DeepDyve account if you don’t already have one.