Peterson olefination reaction using (trimethylgermyl)acetate. Stereoselective synthesis of (E)-2-alkenoic acid esters
摘要:
Peterson-type reaction of (trimethylgermyl)acetates 1 with aldehydes and ketones 2 gave stereoselectively (E)-2-alkenoic acid esters (E)-4 after stirring at -78-degrees-C and warming to room temperature. High yields of the reaction intermediates threo- and erythro-3-hydroxy-2-(trimethylgermyl)alkanoic acid esters 3 were obtained when the reaction was quenched at -78-degrees-C. The paths for conversion of threo-3 and erythro-3 to (E)-4 are discussed.
Asymmetric Syntheses of the Homalium Alkaloids (−)-(<i>S</i>,<i>S</i>)-Homaline and (−)-(<i>R</i>,<i>R</i>)-Hopromine
作者:Stephen G. Davies、James A. Lee、Paul M. Roberts、Jeffrey P. Stonehouse、James E. Thomson
DOI:10.1021/jo3012732
日期:2012.8.17
additions of the novel lithium amide reagents lithium (R)-N-(3-chloropropyl)-N-(alpha-methylbenzyl)amide and lithium (R)-N-(3-chloropropyl)-N-(alpha-methyl-p-methoxybenzyl)amide to alpha,beta-unsaturated esters were used as the key steps in syntheses of the homalium alkaloids (-)-(S,S)-homaline and (-)-(R,R)-hopromine. The asymmetric synthesis of (-)-(S,S)-homaline was achieved in 8 steps and 18% overall
Pd(II)—dppb and syngas catalyze regioselective hydroesterification of terminal alkynes under neutral conditions
作者:Bassam El Ali、Jimoh Tijani、Abdel Moneim El-Ghanam
DOI:10.1016/s0040-4039(01)00152-6
日期:2001.3
Palladium(II) regioselectively catalyzes the hydroesterification of terminalalkynesunder syngas forming α,β-unsaturated esters 3 and 4 in excellent chemical yields under neutral conditions. The high selectivity for the linear ester 4 was obtained with a catalytic system that includes Pd(II), 1,4-bis(diphenylphosphino)butane (dppb) and CO/H2 in CH2Cl2 as solvent. The control of the regioselectivity
在中性条件下,钯(II)在合成气中区域选择性地催化末端炔烃的加氢酯化反应,形成出色的化学收率的α,β-不饱和酯3和4。通过在包括CH 2 Cl 2的溶剂中包含Pd(II),1,4-双(二苯基膦基)丁烷(dppb)和CO / H 2的催化体系获得对线性酯4的高选择性。区域选择性的控制在很大程度上取决于配体的类型,溶剂和合成气混合物的使用。
Unexpected AChE inhibitory activity of (2E)α,β-unsaturated fatty acids
作者:Anne Loesche、Jana Wiemann、Zayan Al Halabi、Julia Karasch、Wolfgang Sippl、René Csuk
DOI:10.1016/j.bmcl.2018.09.013
日期:2018.11
A small library of (E) α,β-unsaturated fattyacids was prepared, and 20 different saturated and mono-unsaturated fattyacids differing in chain length were subjected to Ellman’s assays to determine their ability to act as inhibitors for AChE or BChE. While the compounds were only very weak inhibitors of BChE, seven molecules were inhibitors of AChE holding IC50 = 4.3–12.8 M with three of them as significant
制备了一个小的(E)α,β-不饱和脂肪酸文库,并对20种链长不同的饱和和单不饱和脂肪酸进行了Ellman分析,以确定它们充当AChE或BChE抑制剂的能力。虽然这些化合物只是BChE的非常弱的抑制剂,但有7个分子是AChE的抑制剂,IC 50 = 4.3-12.8 M,其中三个是该酶的重要抑制剂。结果表明,反式2-单不饱和脂肪酸比其饱和类似物是更好的AChE抑制剂。此外,筛选结果表明链长对于获得抑制功效至关重要。对于(2 E)二十碳烯酸(图14)显示了抑制常数K i = 1.51±0.09 M和K i '= 7.15±0.55M。所有测试的化合物均为竞争性主要成分的混合型抑制剂。分子模型计算表明活性/非活性化合物与酶AChE和BChE的结合方式不同。
Asymmetric synthesis of (2S,3R)-3-amino-2-hydroxydecanoic acid: The unknown amino acid component of microginin
作者:Mark E. Bannage、Anthony J. Burke、Stephen G. Davies、Christopher J. Goodwin
DOI:10.1016/s0957-4166(00)86173-x
日期:1994.1
Comparison of the 1H and 13C nmr spectroscopic data of the synthetic aminoacids with that reported for the naturally occurring material indicates that the relative stereochemisuy of the AHDA found in microginin is syn. The absolute stereochemistry of the natural aminoacid is shown to be (2S,3R) by comparison of its reported CD spectrum with that recorded for the synthetic material prepared herein.
3-氨基-2-羟基癸酸(AHDA)是一种不寻常的氨基酸,据说发生在最近分离的血管紧张素转化酶抑制剂microgipin中。为了阐明天然存在的物质的立体化学,从而完成微紫精的结构分配,AHDA的(2 R,3 R)-反-非对映异构体和(2 S,3 R)顺-非对映异构体均已被采用。准备好了。合成氨基酸的1 H和13 C nmr光谱数据与天然物质报道的数据比较表明,在微ginin中发现的AHDA的相对立体化学为SYN。通过比较其报告的CD光谱与本文制备的合成材料所记录的CD光谱,天然氨基酸的绝对立体化学显示为(2 S,3 R)。
PROPHYLACTIC OR THERAPEUTIC DRUG FOR PERIPHERAL NEUROPATHY CAUSED BY ANTICANCER AGENT
申请人:Nippon Zoki Pharmaceutical Co., Ltd.
公开号:EP2671578A1
公开(公告)日:2013-12-11
An object of the present invention is to provide a drug which is effective for prophylaxis or therapy of peripheral nerve disorder occurred as a side effect of the administration of anti-cancer agents.
The present invention is to provide a drug containing an ester of C10 fatty acid as an active ingredient for prophylaxis or therapy of peripheral nerve disorder induced by administration of a drug containing at least one of anti-cancer agents. The drug of the present invention containing the compound as an active ingredient is highly useful as a drug for prophylaxis or therapy of peripheral nerve disorder induced by administration of anti-cancer agents.