[EN] SUBSTITUTED 2-AMINO-PYRAZOLYL-[1,2,4]TRIAZOLO[1,5A] PYRIDINE DERIVATIVES AND USE THEREOF [FR] DÉRIVÉS DE 2-AMINO-PYRAZOLYL-[1,2,4]TRIAZOLO[1,5 A] PYRIDINE SUBSTITUÉS ET LEUR UTILISATION
调查了大约300个微生物的集合,以通过对映选择性还原一系列烷基芳基酮来生成手性仲醇的能力。将证明在还原模型酮中有用的微生物培养物排列在多孔板中,并用于快速鉴定能够产生手性醇的特定生物,这些手性醇在几种候选药物的合成中用作中间体。显示大约60种培养物可选择性还原提供R和S的各种酮相应醇的对映体含量为92–99%ee,1-4 g / L时产率高达95%。还报道了基于外消旋醇的选择性微生物氧化的手性醇的替代方法。该研究为通过选择性微生物生物转化产生手性醇提供了有用的参考。
Chiral 2-(2-hydroxyaryl)alcohols (HAROLs) with a 1,4-diol scaffold as a new family of ligands and organocatalysts
作者:Ömer Dilek、Mustafa A. Tezeren、Tahir Tilki、Erkan Ertürk
DOI:10.1016/j.tet.2017.11.054
日期:2018.1
Efficient and modular syntheses of chiral 2-(2-hydroxyaryl)alcohols (HAROLs), novel 1,4-diols carrying one phenolic and one alcohol hydroxyl group, have been developed which led to generation of a small library of structurally diverse HAROLs in enantiomerically pure form. Of the different HAROLs examined, a HAROL based on the indan backbone exhibited the highest activity and enantioselectivity in the
高效和模块化的手性2-(2-羟基芳基)醇(HAROLs)的合成,带有一个酚和一个醇羟基的新型1,4-二醇已被开发出来,这导致在对映异构体中生成结构多样的HAROLS小文库纯形式。在考察的不同HAROL中,基于茚满骨架的HAROL在Ti(O i Pr)4(y高达97%, 88%ee)并在三田膦的促进下在Morita-Baylis-Hillman反应中作为氢键供体有机催化剂发挥作用。
Noscapine Derivatives as New Chiral Catalysts in Asymmetric Synthesis: Highly Enantioselective Addition of Diethylzinc to Aldehydes
chiral induction. The first examples of noscapinoid compounds as efficient catalysts in asymmetric synthesis are now reported. Three derivatives of noscapine were synthesized from its reaction with different Grignard reagents. Asymmetricaddition of diethylzinc to aldehydes was performed in the presence of these catalysts in high yields and good to excellent ees. Noscapine, a natural alkaloid, has
An Amino Alcohol Ligand for Highly Enantioselective Addition of Organozinc Reagents to Aldehydes: Serendipity Rules
作者:William A. Nugent
DOI:10.1021/ol0259488
日期:2002.6.1
bis(2-bromoethyl) ether. Subsequent hydrogenation over 5% Rh on alumina in the presence of morpholine unexpectedly stops at the hexahydro derivative 4. Amino alcohol 4 promotes the enantioselectiveaddition of diethylzinc to aldehydes at room temperature in up to 99% enantiomeric excess.
Enantiomerically pure diamino-bis(tert-thiophene) 1b proved to be a valuable and flexible chiral ligand for Pd- and Zn-catalyzed transformations, allowing for high levels of stereocontrol in asymmetric allylic alkylation (ee up to 99%) and hydrosilylations of prochiral carbonyls (ee up to 97%).
Asymmetric reduction of prochiral ketones using in situ generated oxazaborolidine derived from (1S,2S,3R,4R)-3-amino-7,7-dimethoxynorbornan-2-ol. An efficient synthesis of enantiopure (R)-tomoxetine
作者:Alexandre A.M. Lapis、Ângelo de Fátima、José E.D. Martins、Valentim E.U. Costa、Ronaldo A. Pilli
DOI:10.1016/j.tetlet.2004.11.052
日期:2005.1
Catalytic asymmetric reduction of prochiral ketones was examined in the presence of chiral oxazaborolidine catalyst 2 prepared in situ from (1S,2S,3R,4R)-3-amino-7,7-dimethoxynorbornan-2-ol (1). The optically active secondary alcohols were generally obtained in moderate to high enantiomeric excesses (ee 43–95%) and good yields (75–94%), except for ketones bearing electron-withdrawing groups. The methodology