Short asymmetric syntheses of bioactive β-aryl ethanolamine derivatives via the highly diastereoselective delta lactol oxy-Michael addition
摘要:
Short, stereoselective and efficient total syntheses of the bioactive beta-aryl ethanolamine derivatives (R)-tembamide, (R)-aegeline and (R)-pronethalol have been achieved using the highly diastereoselective oxy-Michael addition of 'naked' delta lactol anions to nitro olefins as the key step. (C) 2003 Elsevier Ltd. All rights reserved.
Indole-to-Carbazole Strategy for the Synthesis of Substituted Carbazoles under Metal-Free Conditions
作者:Shanping Chen、Yuxia Li、Penghui Ni、Huawen Huang、Guo-Jun Deng
DOI:10.1021/acs.orglett.6b02762
日期:2016.10.21
An efficient indole-to-carbazole strategy has been developed under metal-free conditions. This carbazole formation was highly promoted by NH4I with high regioselectivity through formal [2 + 2 + 2] annulation of indoles, ketones, and nitroolefins. It thus conveniently enabled the assembly of a large number of diversified carbazole products with good tolerance of a broad range of functional groups.
Metal-Free Synthesis and Photophysical Properties of 1,2,4-Triarylpyrroles
作者:Dan Chang、Jinjin Chen、Yong Liu、Huawen Huang、Anjun Qin、Guo-Jun Deng
DOI:10.1021/acs.joc.0c01788
日期:2021.1.1
4-triaryl-substituted pyrrole products were obtained in good to high yields. Furthermore, 2,3,5-triaryl-substituted pyrroles were selectively formed in the absence of nitrovinylarenes. The photophysicalproperties of some pyrrole products have been investigated to show good aggregation-induced emission (AIE) activity.
The conversion of aryl alkenes into β‐nitrostyrenes or benzonitriles with NaNO2 can be governed by an appropriate choice of ionic liquid medium. A general trend was found for the selectivity of these processes, which depends on the nature of IL, with imidazolium‐based ILs, such as [Bmim] Cl, that favor the formation of β‐nitrostyrenes, while tetraalkylammonium‐based ILs, such as TBAA, that favor the
and moisture‐stable, highly efficient ruthenium NNN pincer complex is reported for the first time to catalyze the tandem transformation of various aromatic and aliphatic nitro compounds into the corresponding N‐methylated amines in up to 98 % yield by using methanol as a green methylating agent. Gram‐scale reactions of challenging nitro substrates demonstrated the practical application aspects of this