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.
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
Bryostatins: The Asymmetric Synthesis of the C<sub>1</sub>-C<sub>9</sub>and C<sub>17</sub>-C<sub>27</sub>Fragments
作者:Jef De Brabander、Maurits Vandewalle
DOI:10.1055/s-1994-25589
日期:——
The construction of the fragments C1-C9 3 and C17-C27, 4a of the bryostatins in a enantioselective and highly diastereoselective fashion is described. The usefulness of the "chiron" approach is illustrated with the synthesis of these fragments from, respectively, D-pantolactone (6) and D-isobutyl lactate (23) as chiral templates.
Homogeneous cis-dihydroxylation and epoxidation of olefins with high H2O2 efficiency by mixed manganese/activated carbonyl catalyst system
作者:Jelle Brinksma、Lizette Schmieder、Gerbert van Vliet、Rob Boaron、Ronald Hage、Dirk E De Vos、Paul L Alsters、Ben L Feringa
DOI:10.1016/s0040-4039(02)00292-7
日期:2002.4
[Mn2O3(tmtacn)2](PF6)2 (tmtacn=1,4,7-trimethyl-1,4,7-triazacyclononane) in combination with glyoxylic acid methylester methyl hemiacetal (GMHA) results in a highly active and hydrogenperoxideefficientcatalyst for the epoxidation of olefins as well as the first homogeneous catalytic cis-dihydroxylation system with H2O2 and with turnover numbers up to 420.
[Mn 2 O 3(tmtacn)2 ](PF 6)2(tmtacn = 1,4,7-三甲基-1,4,7-三氮杂环壬烷)与乙醛酸甲酯甲基半缩醛(GMHA)结合使用会导致一种高活性和过氧化氢有效的催化剂,用于烯烃的环氧化,以及第一个均相催化的H 2 O 2顺式-二羟基化系统,其周转数最高为420。
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