A two-step procedure involving cross-metathesis and reductive amination enables easy access to α-methylamines and α,α′-dimethyldiamines from a wide variety of terminal olefins.
Control of β‐Branching in Kalimantacin Biosynthesis: Application of<sup>13</sup>C NMR to Polyketide Programming
作者:Paul D. Walker、Christopher Williams、Angus N. M. Weir、Luoyi Wang、John Crosby、Paul R. Race、Thomas J. Simpson、Christine L. Willis、Matthew P. Crump
DOI:10.1002/anie.201905482
日期:2019.9.2
The presence of β-branches in the structure of polyketides that possess potent biological activity underpins the widespread importance of this structural feature. Kalimantacin is a polyketide antibiotic with selective activity against staphylococci, and its biosynthesis involves the unprecedented incorporation of three different and sequential β-branching modifications. We use purified single and multi-domain
在具有强大生物活性的聚酮化合物结构中,β分支的存在加强了该结构特征的广泛重要性。卡来木霉素是一种对葡萄球菌具有选择性活性的聚酮类抗生素,其生物合成涉及三个不同且连续的β-分支修饰的空前结合。我们使用kalimantacin生物合成机制的纯化的单域和多域酶组分来解决体外如何控制kalimantacin中β分支的模式。要对酶产物进行有力的区分,就需要开发一种通用的测定方法,该方法利用结合到关键生物合成模拟物中的单个13 C标记物的13 C NMR以及酰基载体蛋白的良好动态特性。
Oxydations par le carbonate d'argent sur celite—XIII
作者:M. Fetizon、M. Golfier、J-M. Louis
DOI:10.1016/0040-4020(75)85013-7
日期:1975.1
Silver carbonate on Celite oxidizes primary 1,4-, 1,5-, and 1,6-diols and primary-tertiary diols into lactones in high yield. Primary—secondary diols lead to mixtures of hydroxy-ketones and lactones. Details are given on the synthesis of (±) mevalonolactone.
Organometallic-type reactions in aqueous media mediated by indium. Allylation of acyloyl-imidazoles and pyrazoles. Regioselective synthesis of β,γ-unsaturated ketones
作者:Vernal J. Bryan、Tak-Hang Chan
DOI:10.1016/s0040-4039(97)01512-8
日期:1997.9
Indiummediated coupling of allylic bromide with acyloyl-imidazoles or pyrazoles in aqueousmedia gives the corresponding tertiary alcohols or ketones in good yield. The reaction provides a facile regioselective synthesis of β,γ-unsaturated ketones and its usefulness is demonstrated by the synthesis of the monoterpene artemesia ketone.
Hypocholesterolemic agents III: Inhibition of β‐hydroxy‐β‐methylglutaryl coenzyme a reductase by half acid esters of 1‐(4‐biphenylyl)pentanol
作者:Kenneth E. Guyer、Sharon G. Boots、Paul E. Marecki、Marvin R. Boots
DOI:10.1002/jps.2600650417
日期:1976.4
A series of half acidesters of 1-(4-biphenylyl)pentanol was synthesized and assayed for inhibition of rat liver beta-hydroxy-beta-methylglutaryl coenzyme A reductase. The number of methylenes separating the carboxyl and ester groups was varied from zero to six. A minimum of one methylene was required for reasonable activity. Further separation of the carboxyl and ester groups produced small changes