已经发现三氟乙酸是用于串联克莱森重排和环化反应以从由S N 2反应获得的化合物产生3-芳基亚甲基-3,4-二氢-1 H-喹啉-2-酮的高效和高效试剂。DABCO存在下苯胺与丙烯酸Bayis-Hillman加合物的乙酰基衍生物之间的关系。相反,在三氟乙酸处理下,从Baylis-Hillman丙烯腈加成物的乙酰基衍生物获得的类似化合物通过串联Claisen重排,环化和异构化直接提供3-芳基甲基-2-氨基-喹啉。
Transition-Metal-Free Cascade Synthesis of 4-Quinolones: Umpolung of Michael Acceptors via Ene Reaction with Arynes
作者:R. Santhosh Reddy、Chandraiah Lagishetti、I. N. Chaithanya Kiran、Hengyao You、Yun He
DOI:10.1021/acs.orglett.6b01830
日期:2016.8.5
adducts through a cascade sequence involving an insertion/cyclization/enereaction process to afford 4-quinolones in high yields with a broad substrate scope under mild reaction conditions. Essentially, an umpolung of reactivity at the β carbon of α,β-unsaturated ketone has been achieved by an inverse electron demand aryne–ene reaction to provide a C-arylated product.
Palladium-catalyzed α-regioselective allylic amination of Morita–Baylis–Hillman acetates with simple aromatic amines
作者:Yan Wang、Li Liu、Dong Wang、Yong-Jun Chen
DOI:10.1039/c2ob25976a
日期:——
An efficient allylic amination of Morita–Baylis–Hillman acetates with simplearomaticamines provided good yields with excellent α-regioselectivity (up to exclusive α-product) under the catalysis of Pd2(dba)3/ferrocene-type diphosphine ligand.