Synthesis ofAristotelia-Type Alkaloids. Part III. (3R,4R)- and (3R,4S)-1-p-menthene-3,8-diol and the corresponding racemates: Preparation and assignment of configuration
from 3-methyl-2-cyclohexen-1-one. The relative configuration of the diols, purified via the corresponding cyclocarbonates, was assigned by 1H-NMR spectroscopy and found to be at variance with tentative claims in the literature. Optically active samples of 3 and 4 were prepared by resolution of the racemates with (R)-1-phenylethylamine. The absolute configuration of the resulting diols was determined
A 1:1混合物中的外消旋的反式-和顺式-1- p -menthene -3,8-二醇((±) - 3及(±) - 4,RESP)在3个步骤中很容易地制备由3-甲基-2-环己烯-1-酮。通过1 H-NMR光谱法确定了通过相应的环碳酸酯纯化的二醇的相对构型,发现其与文献中的初步主张不符。的光学活性的样品3和4是由(与拆分外消旋物制备ř)-1-苯基乙胺。通过与已知绝对构型的标准品的化学相关性确定所得二醇的绝对构型。
Arylruthenium(III) Porphyrin-Catalyzed C–H Oxidation and Epoxidation at Room Temperature and [Ru<sup>V</sup>(Por)(O)(Ph)] Intermediate by Spectroscopic Analysis and Density Functional Theory Calculations
作者:Ka-Pan Shing、Bei Cao、Yungen Liu、Hung Kay Lee、Ming-De Li、David Lee Phillips、Xiao-Yong Chang、Chi-Ming Che
DOI:10.1021/jacs.8b04470
日期:2018.6.6
metal catalysts for efficient oxidation of hydrocarbons and identification of the reactive intermediates in the oxidation catalysis are long-standing challenges. In the rapid hydrocarbon oxidation catalyzed by ruthenium(IV) and -(III) porphyrins, the putative Ru(V)-oxo intermediates remain elusive. Herein we report that arylruthenium(III) porphyrins are highly active catalysts for hydrocarbon oxidation