戊唑醇是一种手性三唑类杀菌剂,作为外消旋混合物在全球农业中使用,但其对映体在生物活性和环境行为方面表现出显着的对映选择性差异。叔丁基造成的空间位阻给戊唑醇对映体的合成带来了巨大的挑战。在这里,我们设计了一种简单的化学酶法来不对称合成( R )-戊唑醇,其中包括外消旋环氧前体(2-叔丁基-2-[2-(4-氯苯基)乙基]环氧乙烷的生物催化拆分, rac - 1a )由大肠杆菌/ Rpeh全细胞表达来自Rhodotorula paludigensis的环氧化物水解酶( Rp EH),然后一步化学催化合成( R )-戊唑醇。观察到( S ) -1a优先被大肠杆菌/ Rpeh水解,而( R ) -1a被保留,比活性为103.8 U/g湿细胞,中等对映体比率( E值)为13.4,优化反应条件后,显着提高至43.8。此外,使用 150 mg/mL大肠杆菌/Rpeh湿细胞进行了 200 mM rac - 1a的克级分辨率,结果
Preparation and evaluation of a triazole‐bridged
<i>bis</i>
(β‐cyclodextrin)–bonded chiral stationary phase for HPLC
作者:Yazhou Shuang、Yuqin Liao、Hui Wang、Yuanxing Wang、Laisheng Li
DOI:10.1002/chir.23147
日期:2020.2
spectroscopy, massspectrometry, elemental analysis, and thermogravimetric analysis. The chiral performance of TBCDP was evaluated by using chiral pesticides and drugs as probes including triazoles, flavanones, dansyl amino acids and β‐blockers. Some effects of the composition in mobile phase and pH value on the enantioseparations were investigated in different modes. The nine triazoles, eight flavanones, and
Conventional Chiralpak ID vs. Capillary Chiralpak ID-3 Amylose Tris-(3-Chlorophenylcarbamate)-Based Chiral Stationary Phase Columns for the Enantioselective HPLC Separation of Pharmaceutical Racemates
作者:Marwa Ahmed、Marina Gwairgi、Ashraf Ghanem
DOI:10.1002/chir.22390
日期:2014.11
enantioselective analysis using immobilized amylose tris‐(3‐chlorophenylcarbamate) as chiral stationaryphase in conventional high‐performance liquid chromatography (HPLC) with Chiralpak ID (4.6 mm ID × 250 mm, 5 µm silica gel) and micro‐HPLC with Chiralpak ID‐3 (0.30 mm ID × 150 mm, 3 µm silica gel) was conducted. Pharmaceutical racemates of 12 pharmacological classes, namely, α‐ and β‐blockers, anti‐inflammatory
在传统的高效液相色谱(HPLC)中采用Chiralpak ID(4.6 mm ID×250 mm,5 µm硅胶)和Micro-HPLC(Chiralpak),使用固定化直链淀粉三(3-氯苯基氨基甲酸酯)作为手性固定相进行比较对映选择性分析进行ID-3(0.30 mm ID×150 mm,3 µm硅胶)。筛选了12种药理学级别的药物外消旋体,即α和β阻滞剂,抗炎药,抗真菌药,多巴胺拮抗剂,去甲肾上腺素-多巴胺再摄取抑制剂,儿茶酚胺,镇静催眠药,利尿药,抗组胺药,抗癌药和抗心律失常药在正常相位条件下。研究了有机改性剂对分析物保留和对映体识别的影响。对1-ac烯醇,卡洛芬,西脂洛尔,西唑烷醇,咪康唑,戊唑醇,4-羟基-3-甲氧基扁桃酸,1-吲哚醇,1-(2-氯苯基)乙醇,1-苯基-2-丙醇,黄烷酮,6-羟基黄酮,4-溴戊二酰亚胺和戊巴比妥使用常规HPLC,用5 µm硅胶柱填充4.6 mm内径。尽管如此,在装有3
Preparation of a novel bridged bis(β-cyclodextrin) chiral stationary phase by thiol–ene click chemistry for enhanced enantioseparation in HPLC
作者:Ning Zhang、Siyu Guo、Bolin Gong
DOI:10.1039/d1ra04697g
日期:——
resonance (1H NMR), solid state 13C nuclear magnetic resonance (13C NMR) spectra spectrum, scanning electron microscope, elemental analysis, massspectrometry, infrared spectrometry and thermogravimetric analysis. The performance of HTCDP in enantioseparation was systematically examined by separating 21 chiral compounds, including 8 flavanones, 8 triazole pesticides and 5 other common chiral drugs (benzoin
Iminooxy-substituted benzyl phenyl ethers, processes and intermediates for their preparation, compositions comprising them, and their use for controlling harmful fungi
申请人:——
公开号:US20020082303A1
公开(公告)日:2002-06-27
Iminooxy-substituted benzyl phenyl ethers of the formula I
1
in which the substituents and the index are as defined below:
Y is H, CH
3
, F or Cl;
Q is C(═CHOCH
3
)—COOCH
3
, C(═CHCH
3
)—COOCH
3
, C(═NOCH
3
)—COOCH
3
, C(═NOCH
3
)—CONHCH
3
or N(—OCH
3
)—COOCH
3
;
X is hydrogen, halogen, alkyl, alkoxy or CF
3
;
m is 1 or 2, where the radicals X may be different if m=2;
R
1
is alkyl and
R
2
is hydrogen or alkyl; or R
1
and R
2
together are cyclopropyl, cyclopentyl or cyclohexyl;
R
3
is alkyl or CF
3
; and
R
4
is alkyl, alkenyl, alkynyl, haloalkyl, haloalkenyl or haloalkynyl;
processes and intermediates for their preparation, compositions comprising them, and their use, are described.
A New Chiral Residue Analysis Method for Triazole Fungicides in Water Using Dispersive Liquid-Liquid Microextraction (DLLME)
作者:Mai Luo、Donghui Liu、Zhiqiang Zhou、Peng Wang
DOI:10.1002/chir.22172
日期:2013.9
residue analysis of the enantiomers of four chiral fungicides including hexaconazole, triadimefon, tebuconazole, and penconazole in water samples was developed by dispersive liquid–liquid microextraction (DLLME) pretreatment followed by chiral high‐performance liquid chromatography (HPLC)‐DAD detection. The enantiomers were separated on a Chiralpak IC column by HPLC applying n‐hexane or petroleum ether as
通过分散液-液微萃取(DLLME)预处理,然后进行手性分离,开发了一种快速,简单,可靠且环境友好的方法,用于分析水样中四种手性杀菌剂(包括六康唑,三唑酮,戊唑醇和戊康唑)的对映体的残留量。高效液相色谱(HPLC)-DAD检测 将对映体通过HPLC施加在Chiralpak IC柱分离Ñ以己烷或石油醚为流动相,以乙醇或异丙醇为改性剂。研究了流动相组成和温度对分离度的影响,在最佳条件下,大多数对映体可在20分钟内完全分离。热力学参数表明分离是由焓驱动的。洗脱顺序通过圆二色性检测器(CD)和旋光色散检测器(ORD)进行检测。研究和优化了影响DLLME性能的水样中手性杀菌剂残留预处理参数,例如萃取和分散溶剂及其体积。在最佳微萃取条件下,富集因子超过121,线性度为30–1500 µg L -1相关系数(R 2)超过0.9988,加标水平分别为0.5、0.25和0.05 mg L -1(每种对映体)时,回收率在88