Utilization of Sulfide, Sulfoxide, and Sulfone Groups as Regiochemical Control Elements in the Diels–Alder Reaction of Naphthoquinones
作者:Masatomo Iwao、Tsukasa Kuraishi
DOI:10.1246/bcsj.60.4051
日期:1987.11
The Diels–Alderreactions of 2-phenylthio-, 2-phenylsulfinyl-, and 2-phenylsulfonyl-1,4-naphthoquinones, which were unsymmetrically substituted by methoxyl group on the benzenoid ring, with some vinylketene acetals were studied. The regioselectivity of the reactions was cleanly controlled by each of these sulfur substituents. In addition, the reactivity of the naphthoquinones were greatly enhanced
Synthesis of Macrosporin and Related 9,10-Anthraquinones by Biomimetic Polyketide Aromatization and Cyclization of 6-Benzylresorcylates
作者:Jens Cordes、Anthony G. M. Barrett
DOI:10.1002/ejoc.201201480
日期:2013.3
This paper describes the synthesis of an array of 9,10-anthraquinones 2 by initial preparation of 6-benzylresorcylates 3 from oxo-dioxinone precursors 4 and their subsequent conversion to anthrones by cyclization and oxidation. Resorcylates 3 were obtained by an improved two-step procedure from oxo ester 5 and acylchlorides 6. These methods were applied in a seven-step synthesis of the fungal natural