Non-Cryogenic, Ammonia-Free Reduction of Aryl Compounds
申请人:University of Pittsburgh - Of the Commonwealth System of Higher Education
公开号:US20220089508A1
公开(公告)日:2022-03-24
A method of reducing an aromatic ring or a cyclic, allylic ether in a compound includes preparing a reaction mixture including a compound including an aromatic moiety or a cyclic, allylic ether moiety, an alkali metal, and either ethylenediamine, diethylenetriamine, triethylenetetramine, or a combination thereof, in an ether solvent; and reacting the reaction mixture at from −20° C. to 30° C. for a time sufficient to reduce a double bond in the aromatic moiety to a single bond or to reduce the cyclic, allylic ether moiety.
New compounds 4-methyl-1,4-cyclohexadiene-1-carboxaldehyde syn-oxime, 4-methoxymethyl-1,4-cyclohexadiene-1-carboxaldehyde syn-oxime, and 4-(1-methoxyethyl)-1,4-cyclohexadiene-1-carboxaldehyde syn-oxime, as well as the compound 1,4-cyclohexadiene-1-carboxaldehyde syn-oxime, are found to have a high degree of sweetness which is accompanied by very little off-taste. The compounds have good stability even in acid solution. They give no evidence of toxicity and can be employed in foods and beverages as synthetic sweetening ingredients.
Synthesis of trans-perhydroisoquinolines by 6-endo-trig radical cyclization of amino-tethered vinyl bromides and cyclohexenes
作者:Josefina Quirante、Xavier Vila、Laura Paloma、Josep M. Guiu、Josep Bonjoch
DOI:10.1016/j.tet.2006.11.087
日期:2007.2
Bu3SnH-promoted cyclization of several N-(2-bromoprop-2-enyl)-N-[(4-oxocyclohex-l-enyl)methyl]alkylamines is reported. It has been found that the generated vinyl radicals evolve through a 6-endo-cyclization pathway giving rise to the corresponding 4,6-functionalized perhydroisoquinolines in a prevalent trans-relative configuration. (c) 2006 Elsevier Ltd. All rights reserved.
Enantioselective Total Synthesis of the Antifungal Natural Products Chlorotetaine, Bacilysin, and Anticapsin and of Related Compounds: Revision of the Relative Configuration
作者:Hanno Wild
DOI:10.1021/jo00089a019
日期:1994.5
Enantioselective and diastereoselective syntheses of the title antifungal natural products and some of their diastereoisomers are described. Key steps include the diastereoselective 1,6-addition of bislactim ether 14 and a stereoselective, deprotonation of ketone 17 using lithium (S,S)-bis(1-phenylethyl)amide as a chiral base. All natural products possess the (S)-configuration at C-1 of the substituted cyclohex(en)yl residues of the C-terminal amino acids, which contradicts the assignments in the literature. At physiological pH most of the dipeptides are instable and react by an intramolecular 1,4-addition with the formation of 6-oxoperhydroindoles.