Directed Metalation–Suzuki–Miyaura Cross-Coupling Strategies: Regioselective Synthesis of Hydroxylated 1-Methyl-phenanthrenes
作者:Kåre B. Jørgensen、Toni Rantanen、Thilo Dörfler、Victor Snieckus
DOI:10.1021/acs.joc.5b01300
日期:2015.10.2
A general, efficient, and regioselective synthesis of a series of hydroxylated 1-methylphenanthrenes 9 by a combined directed ortho metalation (DoM)-Suzuki-Miyaura cross-coupling directed remote metalation (DreM) sequence is reported. Diversity to this methodology was achieved by a regioselective DoM rather than DreM reaction, affording more highly substituted phenanthrols (Table 2). Application of the turbo-Grignard reagent (i-PrMgCl-LiCl) in the Ni-catalyzed Corriu-Kumada reaction gave efficient decarbamoylation (Tables 3 and 4). Additional features are the TMS protecting group and halo-induced ipso-desilylation tactics applied to the regioselective synthesis of phenanthrenes (Scheme 2).
7-METHOXY-8-ACETYL- AND 7-METHOXY-9-ACETYL-1,2,3,4-TETRAHYDROPHENANTHRENE AND AMINO CARBINOLS DERIVED FROM THEM<sup>1</sup>
作者:JOHN M. GRIFFING、ROBERT C. ELDERFIELD
DOI:10.1021/jo01172a003
日期:1946.3
69. Syntheses in the phenanthrene series. Part I. 2-Methoxy-1-methylphenanthrene