Total Syntheses of 2,2‘-epi-Cytoskyrin A, Rugulosin, and the Alleged Structure of Rugulin
摘要:
The total syntheses of 2,2'-epi-cytoskyrin A, rugulosin, and the alleged structure of rugulin are described. These naturally occurring bisanthraquinones and their relatives are characterized by novel molecular architectures at the core, at which lies a more or less complete, cage-like structural motif termed "skyrane". The strategies developed for their total synthesis feature a cascade sequence called the "cytoskyrin cascade" and deliver these molecules in short order and in a stereoselective manner.
Anionic Annulation of 3-Cyanophthalides with Allene Carboxylates: A Carbon-Conserved Synthesis of Naphtho[<i>b</i>]furanones
作者:Supriti Jana、Dipakranjan Mal
DOI:10.1021/acs.joc.8b00272
日期:2018.4.20
The reaction of 3-cyanophthalides with allene carboxylates in the presence of tBuOLi results in a tandem annulation furnishing naphtho[b]furanones in good yields with no loss of carbon. The carbon economy is explained by a tandem process, in which the initially expelled cyanide induces the second annulation.
在t BuOLi的存在下3-氰基邻苯二甲酸酯与羧酸烯丙酯的反应导致串联环化提供了萘[ b ]呋喃酮,收率很好,并且没有碳的损失。碳经济通过串联过程来解释,其中最初排出的氰化物引起第二次成环。
Biomimetic studies towards the cardinalins: synthesis of (+)-ventiloquinone L and an unusual dimerisation
作者:Jonathan Sperry、Jimmy J. P. Sejberg、Frank M. Stiemke、Margaret A. Brimble
DOI:10.1039/b905077a
日期:——
Studiestowards the biomimetic synthesis of cardinalin 3 are described. Despite the successful enantioselective synthesis of the monomeric pyranonaphthoquinone ventiloquinone L, it subsequently failed to undergo a proposed biomimetic homodimerisation to cardinalin 3 using a range of oxidants. However, treatment of a related naphthopyran with cerium ammonium nitrate (CAN) facilitated a tandem biaryl
Applications of [4+2] Anionic Annulation and Carbonyl-Ene Reaction in the Synthesis of Anthraquinones, Tetrahydroanthraquinones, and Pyranonaphthoquinones
作者:Shyam Basak、Dipakranjan Mal
DOI:10.1021/acs.joc.7b01987
日期:2017.10.20
5-dienoates, susceptible to isomerization by acids and bases, are suitable for the [4+2] anionic annulation to give 3-(2-alkenyl)naphthoates in regiospecific manner. When combined with intramolecular carbonyl-enereaction (ICE), the accessibility of the naphthoates culminates in a new synthesis of anthraquinones and diastereoselective synthesis of tetrahydroanthraquinones. This strategy has also resulted in a
Synthesis of functionalized hydroxyphthalides and their conversion to 3-cyano-1(3H)-isobenzofuranones. The Diels-Alder reaction of methyl 4,4-diethoxybutynoate and cyclohexadienes
作者:John N. Freskos、Gary W. Morrow、John S. Swenton
DOI:10.1021/jo00206a016
日期:1985.3
FRESKOS, J. N.;MORROW, G. W.;SWENTON, J. S., J. ORG. CHEM., 1985, 50, N 6, 805-810