从可再生原料和使用温和的反应条件化学和生物催化合成非规范α-氨基酸(ncAAs)尚未得到有效解决。在这里,我们展示了一种三步,可扩展且模块化的单锅生物梯级的开发,该级联可将可再生脂肪酸(FAs)线性转化为对映纯l -α-氨基酸。在模块1中,P450过氧合酶P450 CLA催化FA的选择性α-羟基化。通过使用自动化的H 2 O 2补充系统,可以将多种FA(C6:0至C16:0)的FA有效转化(46%至> 99%; TTN> 3300),转化为有价值的α-羟基酸(α-HAs; > 90%α-选择性)以制备规模显示(最大2.3 g L -1隔离产品)。在模块2中,氧化还原-中性氢借入级联反应(酒精脱氢酶/氨基酸脱氢酶)使α-HAs进一步转化为l -α-AAs(20%至99%)。对映体纯的l -α-AAs(ee> 99%),包括药物合成的l-高苯丙氨酸,产品滴定度最高可达2.5 g L -1。该生
Asymmetric biomimetic transamination is a highly attractive method for synthesis of chemically and biologically important chiral amino acids and chiral amines. Development of chiral pyridoxamines/pyridoxals is the key for the reaction. New axially chiral biaryl pyridoxamines based on H4-naphathene skeleton have been developed. The pyridoxamines display good enantioselectivity and high catalytic activity
[EN] BETA-HAIRPIN PEPTIDOMIMETICS<br/>[FR] PEPTIDOMIMÉTIQUES EN ÉPINGLE À CHEVEUX BÊTA
申请人:POLYPHOR AG
公开号:WO2016050361A1
公开(公告)日:2016-04-07
Beta-hairpin peptidomimetics of the general formula (I), cyclo[P1-P2-P3-P4-P5-P6- P7-P8-P9-P10-P11-P12-T1-T2] a nd pharmaceutically acceptable salts thereof, with P1 to P12, T1 and T2 being elements as defined in the description and the claims, have Gramnegative antimicrobial activity to e.g. inhibit the growth or to kill microorganisms such as Klebsiellapneumoniae and/or Acinetobacter baumannii and/or Escherichia coli. They can be used as medicaments to treat or prevent infections or as disinfectants for foodstuffs, cosmetics, medicaments or other nutrient-containing materials. These peptidomimetics can be manufactured by a process which is based on a mixed solid- and solution phase synthetic strategy.
METHOD FOR PRODUCING 2-OCTYLGLYCINE ESTER HAVING OPTICAL ACTIVITY
申请人:AMINOLOGICS CO., LTD.
公开号:US20210179538A1
公开(公告)日:2021-06-17
A method for producing a 2-octylglycine ester having optical activity from a racemic 2-octyl-DL-glycine ester and, more particularly, to a method for producing a 2-octyl-L-glycine ester or a 2-octyl-D-glycine ester by using a chiral mandelic acid as an optical resolution agent.
A new type of chiral pyridoxamines bearing an adjacent chiral stereocenter has been developed via multi-step synthesis. The pyridoxamines displayed catalytic activity in asymmetric transamination of α-keto acids to give a variety of optically active amino acids in 27–78% yields with 34–62% ee’s under very mildconditions. This work provides a synthetic strategy to construct newchiral pyridoxamines
novel chiral pyridoxamines 3a–g containing a sidechain has been developed. The pyridoxamines displayed catalytic activity and promising enantioselectivity in biomimetic asymmetric transamination of α-keto acids, to give various α-amino acids in 47–90% yields with up to 87% ee’s under very mild conditions. An interesting effect of the sidechain on enantioselectivity was observed in the reaction.