Solvent-Dependent Chemoselectivity in Ruthenium-Catalyzed Cyclization of Iodoalkyne−Epoxide Functionalities
摘要:
Treatment of 1-(2'-iodoethynylphenyl)-2-propyloxirane (3) with TpRuPPh(3)(CH3CN)(2)PF6 catalyst (10mol%) produced 1-iodo-2-naphthol (3a) exclusively in DMF, but gave 2-lodobenzo[d]oxepin (3b) efficiently in benzene. Such a solvent-dependent chemoselectivity suggests a solution equilibrium between ruthenium-pi-iodoalkyne and ruthenium-2-iodovinylidene intermediates.
De Novo Synthesis of Phenols and Naphthols through Oxidative Cycloaromatization of Dienynes
作者:Ming-Guang Rong、Tian-Zhu Qin、Xin-Rui Liu、Hong-Fa Wang、Weiwei Zi
DOI:10.1021/acs.orglett.8b02786
日期:2018.10.5
In this work, a rhodium-catalyzed oxidative cycloaromatization of dienynes, which provides a highly straightforward and efficient way to access polysubstituted naphthols and phenols under mild conditions, is described. Challenged electron-withdrawing groups are well tolerated in this protocol, and late-stage phenyl ring formation is demonstrated.