A process for the preparation of a methyl ketone of the formula ##STR1## in which R.sup.1 is alkyl, alkenyl, alkinyl, optionally substituted aryl or optionally substituted heteroaryl, R.sup.2 is alkyl, R.sup.3 is alkyl or R.sup.2 and R.sup.3, together with the carbon atom to which they are bonded, from a cycloalkyl ring, comprising reacting a methyl sec.-alkyl ketone of the formula ##STR2## with a halide of the formula R.sup.1 --CH.sub.2 --X in which X is halogen, in the presence of a base, a diluent, and a phase-transfer catalyst.
[EN] ENANTIOSELECTIVE PROCESS FOR THE PREPARATION OF ENANTIOMERS OF SEX PHEROMONES<br/>[FR] PROCÉDÉ ÉNANTIOSÉLECTIF POUR LA PRÉPARATION D'ÉNANTIOMÈRES DE PHÉROMONES SEXUELLES
申请人:COUNCIL SCIENT IND RES
公开号:WO2014115172A1
公开(公告)日:2014-07-31
The invention disclosed herein relates to an enantioselective process for preparation of biologically active (R) and (S) enantiomers of sex pheromones of the long-tailed Mealybug with high enantiopurity having significant biological activity. Further, the invention provides absolute configuration of synthesized R and S enantiomers.(I)
Stereocontrolled Synthesis of Amino‐Substituted Carbocycles by Pd‐Catalyzed Alkene Carboamination Reactions
作者:Derick R. White、John P. Wolfe
DOI:10.1002/chem.201700466
日期:2017.4.24
through a stereoselective intermolecular Pd‐catalyzed alkenecarboaminationreaction between alkenyl triflates bearing a pendant alkene and exogenous amine nucleophiles. The reactions are effective with a range of different substrate combinations, and proceed with generally high diastereoselectivity. Use of (S)‐tBuPhox as the ligand in reactions of achiral substrates provides enantioenriched products
Hydrogenation of ketones having at least a carbon-carbon double bond in the gamma-,delta-position
申请人:DSM IP Assets B.V.
公开号:EP2535323A1
公开(公告)日:2012-12-19
The present invention relates in a first aspect to a process for hydrogenation of ketones having at least a carbon-carbon double bond in the γ, δ-position to the keto group by hydrogen in the presence of at least one chiral iridium complex having a specific structure and particularly a specific aromatic ligand. It has been shown that this process leads to a strong increase in preferential formation of a single isomer. The process is particularly suitable for the hydrogenation of γ, δ -unsaturated ketones which can be used as flavours and fragrances or for the preparation of vitamin E and its derivatives or of flavours and fragrances.
Rapid Access to Conformational Analogues of (+)-Peloruside A
作者:Zhiming Zhao、Richard E. Taylor
DOI:10.1021/ol203268t
日期:2012.2.3
An efficient synthetic strategy for rapid access to analogues of peloruside A has been demonstrated. The synthetic route was highlighted by a simple esterification-based fragment coupling and a late stage ring-closing metathesis reaction. This convergent route has provided access to rationally designed analogues inspired by the solution conformational preferences of peloruside A.
已经证明了一种快速获得 peloruside A 类似物的有效合成策略。合成路线通过简单的基于酯化的片段偶联和后期闭环复分解反应突出显示。这种收敛路线提供了获得受 peloruside A 的溶液构象偏好启发的合理设计的类似物的途径。