36099-42-0Relevant academic research and scientific papers
SYSTEMS AND METHODS FOR REGIOSELECTIVE CARBONYLATION OF 2,2-DISUBSTITUTED EPOXIDES
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Paragraph 0146; 0151, (2020/06/05)
Provided are methods of carbonylating cyclic substrates to produce carbonyl ated cyclic products. The cyclic substrates may be 2, 2-di substituted epoxides and the cyclic products may be β,β-di substituted lactones. The method may be carried out by forming and pressurizing a reaction mixture of the cyclic substrate, a solvent, carbon monoxide, and a [LA+][CO(CO)4-] catalyst, where [LA+] is a Lewis acid capable of coordinating to the cyclic substrate. The method may proceed with a regioselectivity of 90:10 or greater. The resulting carbonylated cyclic products may be converted to ketone aldol products that retain the stereochemistry and enantiomeric ratio of the carbonyl ated cyclic products.
Photocatalytic Transfer Hydrogenolysis of Allylic Alcohols on Pd/TiO2: A Shortcut to (S)-(+)-Lavandulol
Takada, Yuki,Caner, Joaquim,Kaliyamoorthy, Selvam,Naka, Hiroshi,Saito, Susumu
supporting information, p. 18025 - 18032 (2017/12/08)
We report herein a regio- and stereoselective photocatalytic hydrogenolysis of allylic alcohols to form unsaturated hydrocarbons employing a palladium(II)-loaded titanium oxide; the reaction proceeds at room temperature under light irradiation without stoichiometric generation of salt wastes. Olefin and saturated alcohol moieties tolerated the reaction conditions. Hydrogen atoms were selectively incorporated into less sterically congested carbons of the allylic functionalities. This protocol allowed a short-step synthesis of (S)-(+)-lavandulol from (R)-(?)-carvone by avoiding otherwise necessary protection/deprotection steps.
METHODS FOR OBTAINING OPTICALLY ACTIVE EPOXIDES AND VICINAL DIOLS FROM 2,2-DISUBSTITUTED EPOXIDES
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, (2015/12/19)
The invention provides yeast strains, and polypeptides encoded by genes of such yeast strains, that have enantiospecific 2,2-disubstituted epoxide hydrolase activity. The invention also features nucleic acid molecules encoding such polypeptides, vectors c
Methods for Obtaining Optically Active Epoxides and Vicinal Diols From 2,2-Disubstituted Epoxides
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, (2008/12/08)
The invention provides yeast strains, and polypeptides encoded by genes of such yeast strains, that have enantiospecific 2,2-disubstituted epoxide hydrolase activity. The invention also features nucleic acid molecules encoding such polypeptides, vectors containing such nucleic acid molecules, and cells containing such vectors. Also embraced by the invention are methods for obtaining optically active 2,2-disubstituted vicinal diols and optically active 2,2-disubstituted epoxides.
Facile synthesis of 1,1-disubstituted taurines
Huang, Jiaxing,Du, Da-Ming,Xu, Jiaxi
, p. 315 - 319 (2007/10/03)
A series of 1,1 -disubstituted taurines was synthesized expeditiously from ketones via the Corey-Chaykovsky epoxidation with dimethylsulfonium methylide, episulfidation with potassium sulfocyanate, ring-opening reaction with ammonia in the presence of sil
An improved preparation of epoxides from carbonyl compounds by using diiodomethane/methyllithium: Synthetic applications
Concellón, José M,Cuervo, Humildad,Fernández-Fano, Ramón
, p. 8983 - 8987 (2007/10/03)
Synthesis of epoxides starting from different carbonyl compounds is easily carried out by using a diiodomethane and methyllithium at 0°C and a short reaction time. Starting from α-aminoaldehydes the reaction affords amino epoxides, with high diastereoselectivity. The products were transformed into 1,3-diaminoalkan-2-ols by treatment with different amines.
