An efficient synthesis of 2-alkylpyridines using an alkylation/double decarboxylation strategy
摘要:
We have discovered a novel route for synthesising 2-alkylpyridines by exploiting the decarboxylation of pyridyl malonate esters. Herein we report the synthesis of a number of examples and describe how the reaction was discovered. (C) 2012 Elsevier Ltd. All rights reserved.
Organoselenium-Catalyzed Regioselective C−H Pyridination of 1,3-Dienes and Alkenes
作者:Lihao Liao、Ruizhi Guo、Xiaodan Zhao
DOI:10.1002/anie.201610657
日期:2017.3.13
organoselenium‐catalyzed regioselective C−H pyridination of 1,3‐dienes to form pyridinium salts has been developed. This method was also successfully applied to direct C−H pyridination of alkenes. Fluoropyridinium reagents, or initially loaded pyridine derivatives, acted as pyridine sources in the pyridination reactions. The obtained pyridinium salts could be further converted under different conditions
Enantioselective Alkylation of 2-Alkylpyridines Controlled by Organolithium Aggregation
作者:Joshua J. Gladfelder、Santanu Ghosh、Maša Podunavac、Andrew W. Cook、Yun Ma、Ryan A. Woltornist、Ivan Keresztes、Trevor W. Hayton、David B. Collum、Armen Zakarian
DOI:10.1021/jacs.9b08659
日期:2019.9.25
pyridines provides access to chiral pyridines via an opera- tionally simple protocol that obviates the need for prefunc- tionalization or preactivation of the substrate. The alkylation is accomplished using chiral lithium amides as non-covalent stereodirecting auxiliaries. Crystallographic and solution NMR studies provide insight into the structure of well- defined chiral aggregates in which a lithium
Nickel(II)-Catalyzed Addition of Aryl-, Alkenyl-, and Alkylboronic Acids to Alkenylazaarenes
作者:Xing-Yu Liu、Yun-Xuan Tan、Xin Wang、Hao Xu、Yu-Hui Wang、Ping Tian、Guo-Qiang Lin
DOI:10.1021/acs.orglett.0c01425
日期:2020.5.15
A nickel(II)-catalyzedaddition of aryl-, alkenyl-, and alkylboronic acids to alkenylazaarenes was presented. This reaction exhibited high efficiency (up to 93% yield), a broad substrate scope (seven types of heterocycles), and good functional group compatibility. The resulting products can be further transformed to many useful building blocks. Finally, the preliminary studies suggested that the adjacent
Ni-catalyzed migratory β-selective hydroarylation and hydroalkenylation of alkenyl ketones and alkenyl azahetereoarenes have been realized with aryl boronicacids using alkyl halide as the mild hydride source. This reaction features mild conditions, broad substrate scope and incredible heterocycle compatibility, providing a variety of β-aryl or -alkenyl ketones or heteroarenes in moderate to high yields