Synthesis of tetrahydrofluorenes from the cycloadduct of 3-ethynyl-5-bromo-2-pyrone via cyclocarbopalladation reactions
摘要:
Cycloadduct from 3-ethynyl-5-bromo-2-pyroue undergoes facile cyclocarbopalladation reactions to provide an array of polycarbocyclic Compounds with a complete control of the olefin geometry. Both organotin and boron reagents can be used as a trapping anion source. Treatment of the resulting tetracycles with NaOMe gave rise to various tetrahydrofluorenes in good to excellent isolated yields. (C) 2003 Elsevier Science Ltd. All rights reserved.
Imidazole-Selective Alkyne Hydroamination under Physiological Conditions
作者:Hyung-Joon Kang、Joon-Ho Lee、Dong-Hyun Kim、Cheon-Gyu Cho
DOI:10.1021/acs.orglett.0c02785
日期:2020.10.2
Imidazole-selective intermolecular hydroamination reaction has been discovered. This unprecedented additive-free addition reaction proceeds in an exclusively regioselective and stereoselective manner with high atom economy under extremely mild reaction conditions.