Asymmetric Friedel–Crafts alkylation of indoles with 2-nitro-3-arylacrylates catalyzed by a metal-templated hydrogen bonding catalyst
摘要:
An asymmetric Friedel-Crafts alkylation of indoles with 2-nitro-3-arylacrylates catalyzed by a metal-templated hydrogen bonding catalyst has been established. The asymmetric induction relies on chirality transfer solely from the octahedral metal stereocenter via three weak hydrogen bonds. All the products are provided with good to excellent enantioselectivities while modest diastereoselectivities, which can be converted into a variety of valuable indole-containing chiral building blocks including tryptophan derivatives. (C) 2015 Elsevier Ltd. All rights reserved.
Study of geometric isomerism of ethyl β-aryl(hetaryl)-α-nitroacrylates by 1H NMR spectroscopy method
作者:R. I. Baichurin、D. B. Berestovitskaya、L. V. Baichurina、N. I. Aboskalova、V. M. Berestovitskaya
DOI:10.1134/s1070363216010102
日期:2016.1
furyl and thienyl heteroanalogs depending on the nature of the substituent in the β-position of α-nitroacrylates, deuterated solvent and duration of exposure of the sample were studied by means of 1H NMR spectroscopy.
根据α-硝基丙烯酸酯的β位上取代基的性质,氘代溶剂和样品的暴露时间,研究了α-硝基肉桂酸乙酯的Z → E异构化及其呋喃基和噻吩基杂类似物的特征。1 H NMR光谱。
Synthesis and structure of β-aryl-α-nitroacrylates
作者:R. I. Baichurin、L. V. Baichurina、N. I. Aboskalova、V. M. Berestovitskaya
DOI:10.1134/s1070363213090223
日期:2013.9
The method for preparation of ethyl alpha-nitrocinnamates by nitroacetic acid ester alkenylation with aromatic aldehydes in the presence of acetic acid and beta-alanine has been modified. Structures of the prepared compounds have been proved by electronic, IR, H-1, and C-13-H-1} NMR spectroscopy (including heteronuclear correlation experiments H-1-C-13 HMQC and H-1-C-13 HMBC). In solution these compounds exist in the form of Z-isomer; the Za double dagger"E isomerization is observed in the case of the compound containing strong electron-donor group [N(CH3)(2)] at benzene ring.
Dornow; Menzel, Justus Liebigs Annalen der Chemie, 1954, vol. 588, p. 4043