Kinetic resolution of vic -diols by Bacillus stearothermophilus diacetyl reductase
摘要:
The kinetic resolution of several racemic syn-and anti-1,2-diols by enzymatic oxidation with Bacillus stearothermophilus diacetyl reductase is described. The enantiomerically pure (R,R)- and (R,S)-diols are recovered in almost quantitative yield. (C) 1998 Elsevier Science Ltd. All rights reserved.
A rapid 1,2-dihydroxylation of alkenes using a lipase and hydrogen peroxide under microwave conditions
摘要:
The combined advantages of using an enzyme immobilized lipase from Pseudomonas sp [PSLG6], hydrogen peroxide, ethyl acetate and microwave irradiation for the dihydroxylation of olefins are reported. (c) 2007 Elsevier Ltd. All rights reserved.
Selective transition-metal-free vicinal cis-dihydroxylation of saturated hydrocarbons
作者:Luis Bering、Andrey P. Antonchick
DOI:10.1039/c6sc03055f
日期:——
A transition-metal-free cis-dihydroxylation of saturated hydrocarbons under ambient reaction conditions has been developed. The described approach allows a direct and selective synthesis of vicinal diols. The new reaction thereby proceeds via radical iodination and a sequence of oxidation steps. A broad scope of one-pot dual C(sp3)–H bond functionalization for the selective synthesis of vicinal syn-diols
Synthesis of Longhorn Beetle Pheromone Components by Proline-Mediated α-Hydroxylation of Alkyl Ketones
作者:Viviana Lucía Heguaburu、Hugo do Carmo、María Eugenia Amorós、Andrés González
DOI:10.1055/a-1541-4939
日期:2021.12
The stereoselective synthesis of several components of the aggregation pheromones of numerous longhorn beetle species is described. These attractants consist of 3-hydroxy-2-alkanones and 2,3-alkyldiols with chain lengths varying from six to ten carbons. The 3R- and 3S-series are generated by organocatalytic α-hydroxylation of alkyl ketones with nitrosobenzene in the presence of l- or d-proline, respectively
The first ironcomplex capable of olefin cis-dihydroxylation in combination with H(2)O(2) provides a functionalmodel for Rieske dioxygenases. Mechanistic studies on the model reaction suggest the participation of an Fe(III)(eta(2)-OOH) intermediate, with the oxygen atoms coming exclusively from H(2)O(2) (see reaction scheme; L denotes a tris(6-methyl-2-pyridylmethyl)amine ligand, Solv=solvent). The
The UV irradiation of aliphaticalcohols gave α-glycols as the principal products. The values of the dl-α-glycol ratios obtained in each example were analyzed.
脂肪族醇的紫外线照射得到α-二醇作为主要产物。分析在每个实施例中获得的dl -α-二醇比率的值。
A Colorimetric Method for Quantifying
<i>Cis</i>
and
<i>Trans</i>
Alkenes Using an Indicator Displacement Assay
作者:Stephanie A. Valenzuela、Hannah S. N. Crory、Chao‐Yi Yao、James R. Howard、Gabriel Saucedo、A. Prasanna Silva、Eric V. Anslyn
DOI:10.1002/anie.202101004
日期:2021.6.14
esters, thus displacing the indicator to a greater extent. The generality of the protocol was demonstrated using seven sets of cis and trans alkenes. Blind mixtures of cis and trans alkenes were made, resulting in an average error of ±2 % in the percentage of cis or trans alkenes, and implementing E2 and Wittig reactions gave errors of ±3 %. Furthermore, we developed variants of the IDA for which the color
开发了一种适用于高通量实验的比色指示剂置换测定法 (IDA) 以确定顺式和反式烯烃的百分比。使用 96 孔板进行两个步骤:用于烯烃二羟基化的反应板,然后是由指示剂和硼酸组成的 IDA 筛选板。取决于它们的顺加成或反加成机制,二羟基化从顺式或反式烯烃生成赤型或苏型邻位二醇。三重奏由于产生更稳定的硼酸酯,二醇优先与硼酸结合,从而在更大程度上取代指示剂。使用七组顺式和反式烯烃证明了该协议的一般性。制备顺式和反式烯烃的盲混合物,导致顺式或反式烯烃百分比的平均误差为 ±2% ,实施 E 2和 Wittig 反应的误差为 ±3%。此外,我们开发了 IDA 的变体,可以对其颜色进行调整以优化人眼的响应。