Titanocene-Promoted Intermolecular Couplings of Epoxides with Nitriles. An Easy Access to β-Hydroxyketones
摘要:
Radical couplings of epoxides and nitriles mediated by Cp2TiCl provide a diastereoselective route to the synthesis of beta-hydroxyketones. The conditions of this "aldol-like" reaction are mild enough to avoid the dehydration of the beta-hydroxyketone. The scope of the coupling reaction with functionalized and tetrasubstituted epoxides has been studied. The radical character of the coupling reactions is demonstrated.
PROCESS FOR THE PREPARATION OF OPTICALLY PURE FESOTERODINE DERIVATIVES
申请人:CRYSTAL PHARMA, S.A.U.
公开号:US20150094485A1
公开(公告)日:2015-04-02
3,3-diphenylpropylamines of general formula (I), particularly Fesoterodine, as well as their enantiomers, solvates and salts, can be produced by treating a compound of formula (II) with a chiral alcohol to yield the diastereomeric esters of formula (IV) and (IV′), which can be further transformed into a compound of formula (I), or an enantiomer, solvate or salt thereof, wherein R1 is C1-C8 alkyl; and R2 and R3, independently of one another, represent H or C1-C6 alkyl, or together form a ring of 3 to 7 members with the nitrogen to which they are bound.
Reductive Generation of Enolates from Enones Using Elemental Hydrogen: Catalytic C−C Bond Formation under Hydrogenative Conditions
作者:Hye-Young Jang、Ryan R. Huddleston、Michael J. Krische
DOI:10.1021/ja021163l
日期:2002.12.1
the presence of a Rh(I) catalyst enables reductive enolate generation, as evidenced by electrophilic trapping of the enolate by appendant and exogenous aldehyde partners. The significance of these findings resides in the ability to regioselectivity generate and transform transition metal enolatesunder catalytic conditions that circumvent formation of stoichiometric byproducts.
A process for the stereoselective preparation of a P-chiral four-co-ordinated phosphorus compound, the process comprising reacting a first reactant selected from the group consisting of a chiral alcohol, chiral amine or chiral thiol, with a second reactant comprising a P-chiral three-co-ordinated phosphorus compound, in the presence of an electrophile.