Several benzophenone-β-turned dipeptide-alkyl chain molecules were prepared. In acetonitrile, intramolecular photochemical reaction of the synthetic molecules was investigated. The photoexcited benzophenone moiety abstracted selectively a hydrogen of the alkyl chain in the molecule. Such a site selectivity showed that the β-turned conformation might be rigid enough for the hydrogen abstraction in the excited state.
Concerning the Localization of End Groups in Dendrimers
作者:Anton W. Bosman、Monique J. Bruining、Huub Kooijman、Anthony L. Spek、René A. J. Janssen、E. W. Meijer
DOI:10.1021/ja981626g
日期:1998.8.1
PAMAM dendrimers were studied, crystal structure of the 1st generation dendrimer was obtained, and the amt. of H bonds was estd. The x-ray structure shows multiple interactions between the different endgroups of the dendrimer, modeling the shell of a higher generation dendrimer. Spectroscopic results from solns. of all dendrimers of all generations confirm the close proximity of endgroups
对不同代BOC保护的甘氨酸功能化PAMAM树枝状大分子进行了研究,得到了第一代树枝状大分子的晶体结构,并得到了amt. 的 H 键被估计。X 射线结构显示了树枝状聚合物不同端基之间的多重相互作用,模拟了更高代树枝状聚合物的外壳。溶液的光谱结果。所有世代的所有树枝状聚合物都证实端基非常接近
N-arylation of carbamate-protected glycine derivatives via palladium catalysis
作者:Danielle Falcone、Ekundayo Osimboni、David J. Guerin
DOI:10.1016/j.tetlet.2014.03.016
日期:2014.4
A synthesis of N-aryl and N-heteroaryl amino acid derivatives using palladium catalysis is described. Several carbarnate-protected glycine derivatives react with aryl and heteroaryl halides using a palladium/Xantphos catalyst system to access the desired synthons. (C) 2014 Elsevier Ltd. All rights reserved.