Process for preparing the enantiomeric forms of cis-configured 1,3-cyclohexanediol derivatives
申请人:Aventis Pharma Deutschland GmbH
公开号:US20040209931A1
公开(公告)日:2004-10-21
Process for preparing the enantiomeric forms of cis-configured 1,3-cyclohexanediol derivatives
A process is described for preparing chiral, nonracemic, cis-configured 1,3-disubstituted cyclohexanols of the formula (I)
1
where the radicals are as defined, by means of enzymatic optical resolution.
METHOD FOR THE PREPARATION OF ENANTIOMER FORMS OF CIS-CONFIGURED 3-HYDROXYCYCLOHEXANE CARBOXYLIC ACID DERIVATIVES USING HYDROLASES
申请人:Holla Wolfgang
公开号:US20070197788A1
公开(公告)日:2007-08-23
The present invention relates to a process for preparing chiral non-racemic cis-configured cyclohexanols or cyclohexanol derivatives of the formula (I)
Cis-configured hydroxyl-cyclohexane carboxylic acid derivatives of formula (I) are central building blocks or immediate precursors for the medicinally active compounds which allow a therapeutic modulation of the lipid and/or carbohydrate metabolism and are thus suitable for preventing and/or treating type II diabetes, hyperglycemia and artherosclerosis. The cis-configured hydroxyl-cyclohexane carboxylic acid derivatives of formula (I) are central building blocks or immediate precursors for the medicinally active compounds described in the prior art.
Three-Component Domino Knoevenagel/Hetero-Diels-Alder Reaction for the Synthesis of the Amino Sugars 2-Acetoxyforosamine and 2-Acetoxyossamine - Experimental and Theoretical Results
作者:Lutz F. Tietze、Simone Dietz、Niels Böhnke、M. Alexander Düfert、Ina Objartel、Dietmar Stalke
DOI:10.1002/ejoc.201100725
日期:2011.11
The three-componentdominoKnoevenagel/hetero-Diels–Alderreaction of nitroacetone (6), formaldehyde and ethoxyvinylacetate (4) leads to dihydropyrans 10 and 11, which after hydrogenation of the double bond as well as consecutive reduction of the nitro group and reductive amination give the desired forosamine-type 2-acetoxyamino sugars 21–24 and ossamine-type 25.
The present invention relates to formation of highly enriched (R)-pantolactone acetate from conversion of (R/S)-pantolactone in a process comprising (1) kinetic resolution using variants of Candida antarctica lipase A (CalA) with variations at positions 211, 223, 326 and 327 as an enantioselective acetylating enzyme and (2) racemization of (S)-pantolactone in the presence of at least one specific chemical catalyst which is ruthenium transition metal complex "Shvo catalyst", wherein both steps might be carried-out in a one-pot reaction /system.
本发明涉及从(R/S)-泛酰内酯转化生成高富集(R)-泛酰内酯乙酸酯的工艺,该工艺包括(1)使用在211、223、326和327位上有变化的白色念珠菌脂肪酶A(CalA)变体作为对映体选择性乙酰化酶进行动力学解析,以及(2)在至少一种特定化学催化剂(即金红石催化剂)存在下对(S)-泛酰内酯进行消旋化、(2) 在至少一种特定化学催化剂(即过渡金属钌络合物 "Shvo 催化剂")存在下对 (S) - 潘托内酯进行消旋化,其中这两个步骤可在一个反应锅/系统中进行。
SYNTHESIS OF (R)-PANTOLACTONE ACETATE
申请人:DSM IP Assets B.V.
公开号:EP3748009A1
公开(公告)日:2020-12-09
The present invention relates to a 2-step process comprising step (1) kinetic resolution of R/S-pantolactone using an enantioselective acetylating enzyme and step (2) racemization of (S)-pantolactone in the presence of at least one specific chemical catalyst leading to highly enriched (R)-pantolactone acetate. Both step (1) and (2) might be carried-out in a one-pot reaction/system.