with organoaluminumreagents are executed to furnish limonene as a major product. Since the reaction of 1, 4, and 5 has proved to proceed much faster than that of neryl phenyl ether under the similar conditions, the rate acceleration is attributed to the novel metal-anchimeric assistance of the aluminum reagents bound with the neighboring hydroxyl group for effecting the generation of the allyl cation
On prepare les composes du titre a partir des ethers obtenus par reactiondes bromures de neryle et de farnesyle avec le binaphtyle-1,1' diol-2,2' et le biphenylediol-2,2'
在制备 les composes du titre a partir des ethers obtenus par reaction des bromures de neryle et de farnesyle avec le binaphtyle-1,1' diol-2,2' et le biphenylediol-2,2'
Alcohol Synthesis by Cobalt-Catalyzed Visible-Light-Driven Reductive Hydroformylation
作者:Connor S. MacNeil、Lauren N. Mendelsohn、Tyler P. Pabst、Gabriele Hierlmeier、Paul J. Chirik
DOI:10.1021/jacs.2c07745
日期:2022.10.26
A cobalt-catalyzed reductive hydroformylation of terminal and 1,1-disubstituted alkenes is described. One-carbon homologated alcohols were synthesized directly from CO and H2, affording anti-Markovnikov products (34–87% yield) with exclusive regiocontrol (linear/branch >99:1) for minimally functionalized alkenes. Irradiation of the air-stable cobalt hydride, (dcype)Co(CO)2H (dcype = dicyclohexylphosphinoethane)
描述了钴催化的末端和 1,1-二取代烯烃的还原加氢甲酰化。一碳同系醇直接从 CO 和 H 2合成,提供抗马尔可夫尼科夫产品(34-87% 产率),对最小功能化烯烃具有独特的区域控制(线性/支链 >99:1)。用蓝光照射空气稳定的氢化钴 (dcype)Co(CO) 2 H(dcype = 二环己基膦基乙烷)产生了介导烯烃加氢甲酰化和随后的醛氢化的活性催化剂。通过使用合成气混合物的多核 NMR 光谱对串联催化反应进行原位监测,研究了绝对区域控制的机理起源。
A new sesquiterpene synthase catalyzing the formation of (R)-β-bisabolene from medicinal plant Colquhounia coccinea var. mollis and its anti-adipogenic and antibacterial activities
作者:De-Sen Li、Lin-Lin Shi、Kai Guo、Shi-Hong Luo、Yan-Chun Liu、Yue-Gui Chen、Yan Liu、Sheng-Hong Li
DOI:10.1016/j.phytochem.2023.113681
日期:2023.7
functional characterization of a (R)-β-bisabolene synthase gene (CcTPS2) from a Lamiaceae medicinal plant Colquhounia coccinea var. mollis. The biochemical function of CcTPS2 catalyzing the cyclization of farnesyl diphosphate to form a single product (R)-β-bisabolene was characterized through an engineered Escherichia coli producing diverse polyprenyl diphosphate precursors and in vitro enzyme assay, indicating
具有R和S构型的倍半萜β-红没药烯常见于具有抗菌和抗氧化活性的植物精油中。在这里,我们报告了来自唇形科药用植物Colquhounia coccinea var.的 ( R )- β -红没药烯合酶基因 ( CcTPS2 )的克隆和功能表征。软糖。CcTPS2 催化法尼基二磷酸环化形成单一产物 ( R )-β-红没药烯的生化功能通过工程大肠杆菌表征产生不同的聚异戊二烯二磷酸前体和体外酶测定,表明 CcTPS2 是一种高保真 ( R )-β-红没药烯合酶。在摇瓶条件下,含有外源甲羟戊酸途径、法呢基二磷酸合酶和 CcTPS1 基因的工程大肠杆菌菌株中 ( R )-β-红没药烯的产量为 17 mg/L。最终,从工程大肠杆菌中获得了120 毫克纯化的 ( R )- β -红没药烯,并通过详细的光谱分析(包括 1D 和 2D NMR)阐明了其结构, 和特定的旋转)。通过域交换构建了四种嵌合酶,这改变了