Highly Chemoselective and Regioselective Dehydrogenative Cross-Coupling Reaction between Pyridines and Ethers
摘要:
A highly chemoselective and regioselective dehydrogenative cross-coupling (DCC) reaction of unactivated pyridines with cyclic or acyclic ethers has been developed to give the corresponding 2- or 4-coupled pyridines in satisfactory yields. The DCC reaction affords an efficient and greener synthesis for a range of new pyridines. A possible mechanism involving radical substitution is also proposed.
Rare-Earth Y(OTf)<sub>3</sub> Catalyzed Coupling Reaction of Ethers with Azaarenes
作者:Yue-Hua Wu、Nai-Xing Wang、Tong Zhang、Lei-Yang Zhang、Xue-Wang Gao、Bao-Cai Xu、Yalan Xing、Jian-Yi Chi
DOI:10.1021/acs.orglett.9b02763
日期:2019.9.20
Rare-earth catalysis has become a hot topic in the field of catalytic organic reaction. Chain ethers mostly have lower reactivity and lower boiling points which limited their reaction scope. Herein, we found a rare-earth Y(OTf)(3) can catalyze the coupling reaction of ethers especially chain ethers and thioethers with azaarenes. This protocol features simple operations, a broad substrate scope (31 examples), moderate to good yields (up to 85%), and atom economy.
Zelechonok, Yu. B.; Ivanova, L. P.; Zorin, V. V., Doklady Chemistry, 1987, vol. 297, # 11, p. 494 - 496
作者:Zelechonok, Yu. B.、Ivanova, L. P.、Zorin, V. V.、Zlotskii, S. S.、Rakhmankulov, D. L.
DOI:——
日期:——
ZELECHONOK, YU. B.;IVANOVA, L. P.;ZORIN, V. V.;ZLOTSKIJ, S. S.;RAXMANKULO+, DOKL. AN CCCP, 297,(1987) N 2, 372-375
作者:ZELECHONOK, YU. B.、IVANOVA, L. P.、ZORIN, V. V.、ZLOTSKIJ, S. S.、RAXMANKULO+