Determination of the Absolute Configuration of β-Chiral Primary Alcohols Using the Competing Enantioselective Conversion Method
作者:Alexander S. Burns、Alexander J. Wagner、Jennifer L. Fulton、Kyle Young、Armen Zakarian、Scott. D. Rychnovsky
DOI:10.1021/acs.orglett.7b01189
日期:2017.6.2
A method for determining the absoluteconfiguration of β-chiral primary alcohols has been developed. Enantioenriched alcohols were acylated in the presence of either enantiomer of the enantioselective acylation catalyst HBTM, and the faster reaction was determined by measuring product conversion using 1H NMR spectroscopic analysis. An empirical mnemonic was developed that correlates the absolute configuration
已经开发出确定β-手性伯醇的绝对构型的方法。在对映选择性酰化催化剂HBTM的任何一种对映异构体的存在下,将富含对映体的醇酰化,并通过使用1 H NMR光谱分析测量产物转化率来确定更快的反应。开发了经验助记符,其将醇的绝对构型与更快反应的催化剂相关联。该方法成功的底物包括在立体异构中心带有“指导基团”的伯醇。指导基团包括芳烃,杂芳烃,烯酮和卤化物。
Nickel-Catalyzed Direct Arylation of C(sp<sup>3</sup>)–H Bonds in Aliphatic Amides via Bidentate-Chelation Assistance
作者:Yoshinori Aihara、Naoto Chatani
DOI:10.1021/ja411715v
日期:2014.1.22
The Ni-catalyzed, direct arylation of C(sp(3))-H (methyl and methylene) bonds in aliphatic amides containing an 8-aminoquinoline moiety as a bidentate directing group with aryl halides is described. Deuterium-labeling experiments indicate that the C-H bond cleavage step is fast and reversible. Various nickelcomplexes including both Ni(II) and Ni(0) show a high catalytic activity. The results of a