已经研究了几种α-氨基酸和多肽(包含Gly,L-Ala,L-Leu,L-或DL-Phe和/或L-或D-Val)与空气稀释的氮氧化物的反应模拟被污染的城市空气可能在肺组织中产生的肽键的N-亚硝化。大多数N-保护的α-氨基酸可提供定量的N-亚硝基衍生物。受N保护的二肽提供二亚硝化肽,二亚硝化化合物和单亚硝化化合物的混合物,选择性单亚硝化产物,或根本不发生反应,这主要取决于空间效应。对于一些更高的肽,观察到相同的趋势。保留了原料的手性的(多)亚硝化肽的特征是1 H和13在温和的条件下,经吡咯烷和氨基酯裂解,得到13 C NMR光谱,得到(新的)酰胺或肽以及重氮衍生物。
Efficient palladium-catalyzed cross-coupling reactions of α-diazocarbonyl compounds and arylboronic acids or arylhalides have been developed. The reaction proceeds smoothly for a range of diazo compounds, boronic acids, and halides. The coupling reaction conditions tolerate various substituents on the aromatic rings of the substrates, such as chloro, fluoro, acyl, oxo, ester, and nitro groups. This
Exploring the reaction of iodine with<i>α</i>-diazo esters
作者:Giancarlo Verardo、Paola Geatti、Alberto Gambi
DOI:10.1002/poc.1420
日期:2009.1
In this paper we describe the unprecedented reaction between α‐diazoesters 1 and iodine. The reaction, carried out in the presence of aqueous NaHCO3, afforded the Z‐isomer of the corresponding unsaturated‐2‐iodo ester 8. The configuration of compounds 8 was determined using the 3JCH coupling between carbonyl carbon atom and alkene proton. Mechanistic considerations accounting for the observed phenomena
Arylation and Vinylation of α-Diazocarbonyl Compounds with Boroxines
作者:Cheng Peng、Wei Zhang、Guobing Yan、Jianbo Wang
DOI:10.1021/ol900362d
日期:2009.4.2
An alternative approach for alpha-arylation and alpha-vinylation of carbonyl compounds is described: reaction between aryl- or vinylboroxines with alpha-diazocarbonyl compounds leads to the formation of alpha-arylated or alpha-vinylated carbonyl compounds under mild conditions.