Construction of All‐Carbon Chiral Quaternary Centers through Cu
<sup>I</sup>
‐Catalyzed Enantioselective Reductive Hydroxymethylation of 1,1‐Disubstituted Allenes with CO
<sub>2</sub>
construction of all-carbon chiral quaternary centers through reductive hydroxymethylation of 1,1-disubstituted allenes with CO2 has been developed. In the presence of a copper/Mandyphos catalyst, CO2 is transformed into an alcohol oxidation level by an asymmetric reductive C-C bond formation with allenes by using hydrosilane (HSi(OMe)2 Me) as a reductant. The resulting chiral homoallylic alcohols are
An improved procedure for the synthesis of naphthalene aminoalcohols is described. Four new compounds were prepared and tested by Rane Laboratories for activity vs. Plasmodium berghei in mice. All compounds were active, the most active being 1-[3-(4-chlorophenyl)-5,7-dichloro-1-naphthyl]-3-(di-n-butylamino)propanol hydrochloride (16b). Structure--activity relationships between the naphthalene and
Herbicidal compositions and methods utilizing novel substituted oxirane compounds as active ingredients are disclosed.
除草剂组合物和利用新型取代氧环丙烷化合物作为活性成分的方法已被披露。
Ruthenium-Catalyzed CC Coupling of Fluorinated Alcohols with Allenes: Dehydrogenation at the Energetic Limit of β-Hydride Elimination
作者:Brannon Sam、Tom Luong、Michael J. Krische
DOI:10.1002/anie.201500238
日期:2015.4.27
Ruthenium(II) complexes catalyze the CC coupling of 1,1‐disubstituted allenes and fluorinatedalcohols to form homoallylic alcohols bearing all‐carbon quaternary centers with good to complete levels of diastereoselectivity. Whereas fluorinatedalcohols are relatively abundant and tractable, the corresponding aldehydes are often not commercially available because of their instability.
3,5-Dichloro-.alpha.-methylstyrene is prepared from .alpha.-bromo-3,5-dichlorocumene by reaction with alkali metal hydroxide solutions in the presence of phase-transfer catalysts.