作者:Matthieu J. R. Richter、Michael Schneider、Marco Brandstätter、Simon Krautwald、Erick M. Carreira
DOI:10.1021/jacs.8b09685
日期:2018.12.5
The first synthesis of (-)-mitrephorone A is disclosed along with discussion and study of synthetic strategies. The natural product includes a highly congested hexacyclic ent-trachylobane diterpenoid framework featuring a rare, embedded oxetane. The synthetic analysis presented dissects a number of approaches for the synthesis of the central oxetane, including carbonyl-olefin photocycloadditions, Prins-type
(-)-mitrephorone A 的首次合成与合成策略的讨论和研究一起公开。天然产物包括高度拥挤的六环戊二烯二萜骨架,其特征是稀有嵌入的氧杂环丁烷。合成分析展示了多种合成中心氧杂环丁烷的方法,包括羰基-烯烃光环加成、Prins 型环化和氧化闭环。在成功的路线中,三个 [4 + 2] 环加成能够快速构建所有碳环。羟基二酚与 Koser 试剂的新型后期氧化环化提供了关键的氧杂环丁烷部分。
The relevance of ester exchange in oxalacetic esters to the decarbonmonoxylation reaction
作者:Anthony L Fitzhugh、Richard S Strauss、Elizabeth N Brewer、Steven D Glassman、Maitland Jones
DOI:10.1016/s0040-4039(00)98685-4
日期:1985.1
Oxalacetic esters undergo esterexchange at 120°C, at which temperature loss of CO does not occur. A new mechanism is proposed for the decarbonmonoxylation reaction.
草酰乙酸酯在120°C进行酯交换,在此温度下不会发生CO的损失。提出了一种新的脱碳氨氧化反应机理。
COMPOSITION FOR REGULATING PLANT GROWTH, METHOD FOR TREATING PLANTS THEREWITH, AND ACTIVE INGREDIENT THEREOF
申请人:Gorbunov Sergei Valeryevich
公开号:US20190119193A1
公开(公告)日:2019-04-25
A composition for regulating plant growth, the active ingredient of which is an ester of oxaloacetic acid or a salt thereof, or derivatives thereof, wherein the ester of oxaloacetic acid has the formula set forth below, where R
1
and R
2
are independently selected from a series of C
1
-C
18
alkyl groups, and wherein the content of the active ingredient corresponds to a concentration of from 10
−11
M to 10
−3
M. The active ingredients and compositions for regulating plant growth allow for treating plants in order to stimulate the growth thereof and achieve such advantages as increased yields, improved plant quality, improved nutrient absorption and enhanced stress resistance, while allowing such advantages to be achieved using a relatively small amount of an active ingredient(s) which is/are biodegradable and environmentally friendly.
selectivity for ALKBH5. Cellular thermal shift assay (CETSA) analysis showed that 20m could efficiently stabilize ALKBH5 in HepG2 cells. Dot blot assay demonstrated that 20m could increase m6A level in intact cells. Collectively, 20m is a potent, selective and cellactive ALKBH5 inhibitor and could be used as a versatile chemical probe to explore the biological function of ALKBH5.
AlkB 同系物 5 (ALKBH5) 是一种 RNA m 6 A 去甲基化酶,参与基因转录、翻译和代谢的调控,被认为是多种人类疾病,尤其是癌症的有前途的治疗靶点。然而,仍然缺乏强效和选择性的 ALKBH5 抑制剂。在此,我们报告了一类包含 1-aryl-1 H -吡唑支架的新型 ALKBH5 抑制剂,它们是通过基于荧光偏振的筛选、结构优化和构效关系分析获得的。在这些化合物中,20m是最有效的化合物,其在荧光偏振测定中显示出0.021μM的IC 50值。大院20m对 ALKBH5 与 FTO 以及其他 AlkB 亚家族成员表现出高选择性,表明对 ALKBH5 具有良好的选择性。细胞热转移试验 (CETSA) 分析表明,20m可有效稳定 HepG2 细胞中的 ALKBH5。斑点印迹实验表明,20m可以增加完整细胞中的m 6 A 水平。总的来说,20m是一种有效的、选择性的和具有细胞活性的 ALKBH5
Methods for producing hydroxy amino acids and derivatives thereof
申请人:Rozzell David J.
公开号:US20050100993A1
公开(公告)日:2005-05-12
Hydroxy-amino acids are provided and are prepared by contacting a substituted P-ketodiester having a ketone group and two ester functional groups with a ketoreductase under conditions permitting the reduction of the keytone group to an alcohol. Only one of the ester functional groups is regioselectively hydrolyzed to the corresponding carboxylic acid, whereby a non-hydrolyzed ester functional group remains. The carboxylic acid is converted to an amine to produce a hydroxy-amino acid.