The oxidative demethylation of 1,4-dimethoxynaphthalene and 1,4-dimethoxybenzene derivatives with cobalt(III) fluoride proceeded in good to excellent yield to afford the corresponding naphthoquinone and benzoquinone derivatives.
The Synthesis of a Degradation Product of Phomazarin: A Regiospecific Elaboration of the B and C Rings of the Pigment
作者:Vincent Guay、Paul Brassard
DOI:10.1055/s-1987-27924
日期:——
An attempt to confirm the structure proposed for phomazarin has been initiated by the synthesis of one of its degradation products. The methods chosen also resulted in the regiospecific elaboration of the B and C rings of the pigment and are applicable to eventual syntheses by convergent approaches.
Iodine(V) Reagents in Organic Synthesis. Part 2. Access to Complex Molecular Architectures via Dess−Martin Periodinane-Generated <i>o</i>-Imidoquinones
作者:K. C. Nicolaou、K. Sugita、P. S. Baran、Y.-L. Zhong
DOI:10.1021/ja012125p
日期:2002.3.1
and water. Their chemistry has been extensively investigated and found to lead to p-quinones and polycyclic systems of diverse molecular architectures. Applications of this methodology to the total synthesis of the naturally occurring compounds, epoxyquinomycin B and BE-10988, are described. Finally, another rare chemical entity, the ketohydroxyamide moiety, has been accessed through this DMP-based synthetic
邻亚胺醌是一类相当罕见的化合物,它是由苯胺通过戴斯-马丁高碘烷 (DMP) 和水的作用制备的。它们的化学性质已被广泛研究并发现可产生对醌和不同分子结构的多环系统。描述了这种方法在天然化合物、环氧喹霉素 B 和 BE-10988 的全合成中的应用。最后,另一种罕见的化学实体,酮羟基酰胺部分,已通过这种基于 DMP 的合成技术获得,并对其反应性进行了研究。其最有用的反应之一是一组级联杂环环化,导致各种可能具有生物学相关性的多环系统。
Synthesis of Amino-1,4-benzoquinones and Their Use in Diels–Alder Approaches to the Aminonaphthoquinone Antibiotics
作者:Christopher C. Nawrat、William Lewis、Christopher J. Moody
DOI:10.1021/jo201320g
日期:2011.10.7
A new protocol for the synthesis of protected amino-1,4-benzoquinones by oxidation of the corresponding 2,5-dimethoxyaniline derivatives using PhI(OAc)2 or PhI(OCOCF3)2 in water containing 2.5% methanol is reported. The process represents an improvement over previously reported methods, both in terms of yield and number of steps, and in the range of nitrogen protecting groups that it tolerates. A number