166. Syntheses of polycyclic compounds related to the sterols. Part VII. The cyclisation of γ-5-methoxy-1-naphthylbutyric acid
作者:George A. R. Kon、Henry R. Soper
DOI:10.1039/jr9390000790
日期:——
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).
Determinants of Early and Late Outcome after Surgery for Type A Aortic Dissection
reoperation was 85.4% at 5 years. Multiple factors still influence early and late survival aftersurgery for type A aorticdissection. Preoperative renal impairment both affects early and lateoutcome. Early postoperative course affects lateoutcome in hospital survivors. The presence of the intimal tear in the aortic arch has a negative impact on late survival.