KMnO4-Mediated Oxidation as a Continuous Flow Process
摘要:
An efficient and easily scalable transformation of alcohols and aldehydes to carboxylic acids and nitroalkane derivatives to the corresponding carbonyls and carboxylic acids using permanganate as the oxidant within a continuous flow reactor is reported. Notably, the generation and downstream processing of MnO2 slurries was not found to cause any blocking of the reactor when ultrasound pulses were applied to the flow system.
[EN] NOVEL PROCESS FOR PREPARATION OF OPTICALLY PURE NOREPHEDRINE AND ITS DERIVATIVES [FR] NOUVEAU PROCÉDÉ DE PRÉPARATION DE NORÉPHÉDRINE OPTIQUEMENT PURE ET DE SES DÉRIVÉS
Process for the synthesis of chiral propargylic alcohols
申请人:Lonza Ltd
公开号:EP2447247A1
公开(公告)日:2012-05-02
A process for the synthesis of chiral propargylic alcohols.
手性丙炔醇的合成过程。
Process for the synthesis of cyclic carbamates
申请人:Lonza Ltd
公开号:EP2447255A1
公开(公告)日:2012-05-02
The invention is directed to a process for the preparation of a cyclic carbamate starting with a chiral propargylic alcohol and/or a suitable salt thereof, which is reacted with a cyclisation agent selected from phosgene, diphosgene, triphosgene and mixtures thereof, and in that the reaction is carried out in the presence of an aqueous base, and a water-immiscible organic solvent, said organic solvent mainly comprising at least one compound selected from C2-5-alkyl C2-5-carboxylates and mixtures of at least one C2-5-alkyl C2-5-carboxylate with at least one C5-8-alkane.
Another aspect of the invention is directed to a process for the synthesis of said cyclic carbamate starting described above, wherein also a process for the preparation of the chiral propargylic alcohol is provided.
A new norephedrine-derived chiral base for epoxide rearrangement reactions
作者:Simon E de Sousa、Peter O'Brien、H.Christian Steffens
DOI:10.1016/s0040-4039(99)01740-2
日期:1999.11
The conversion of (1R,2S)-norephedrine into a novel chiral diamine (83% yield, simple two step synthesis) and its use as a chiral base in two epoxiderearrangement reactions is reported. Rearrangement of a 4,5-disubstituted cyclohexene oxide and of a 4-aminosubstituted cyclopentene oxide generated allylic alcohols of >90% ee. These results represent the highest levels of enantioselectivity reported
[EN] ANTICANCER COMPOUND PROCESS<br/>[FR] PROCÉDÉ DE PRÉPARATION D'UN COMPOSÉ ANTICANCÉREUX
申请人:INNOCRIN PHARMACEUTICALS INC
公开号:WO2019113312A1
公开(公告)日:2019-06-13
The present invention relates to a process for preparing compound 1 that useful as an anticancer agent. In particular, the invention seeks to provide new methodology for preparing compound 1 and substituted derivatives thereof.
Enantioselective Conjugate Addition of Catalytically Generated Zinc Homoenolate
作者:Yoshiya Sekiguchi、Naohiko Yoshikai
DOI:10.1021/jacs.1c00869
日期:2021.3.31
derivatives with good to high enantioselectivities. The reaction has proved applicable to various 1-substituted cyclopropanols as well as chalcones and related enones. The chiral amino alcohol has proved to enable ligand-accelerated catalysis of the homoenolate generation and its conjugate addition. Positive nonlinear effects and lower reactivity of a racemic catalyst have been observed, which can be
我们在此报告了通过环丙醇开环催化生成的均烯酸锌与 α,β-不饱和酮的对映选择性共轭加成反应。反应由 Et 2生成的氨基醇锌催化剂促进Zn 和手性 β-氨基醇生成 1,6-二酮,加热后发生分子内醇醛缩合反应,生成具有良好至高对映选择性的高度取代的环戊烯衍生物。该反应已证明适用于各种 1-取代环丙醇以及查耳酮和相关烯酮。手性氨基醇已被证明能够实现同烯醇化物生成及其共轭加成的配体加速催化。已经观察到外消旋催化剂的正非线性效应和较低的反应性,这可归因于稳定且非活性的异手性氨基醇锌二聚体。