Enantioselective Total Synthesis of (−)‐Spiroxins A, C, and D
作者:Xin Shu、Chong‐Chong Chen、Tao Yu、Jiayi Yang、Xiangdong Hu
DOI:10.1002/anie.202105921
日期:2021.8.16
targets for the synthetic community. Based on a scalable enantioselective epoxidation of 5-substituted naphthoquinone, an oxidation/spiroketalization cascade, ortho-selective chlorination of the phenol unit, and oxime-ester-directed acetoxylation, an enantioselectivetotalsynthesis of (−)-spiroxins A and C and the first totalsynthesis of (−)-spiroxin D have been achieved.
螺环素 A、C 和 D 是已在海洋真菌菌株 LL-37H248 中鉴定的代谢物。它们独特的多环结构和有趣的生物活性使它们成为合成社区的有吸引力的目标。基于 5-取代萘醌的可扩展对映选择性环氧化、氧化/螺酮缩酮级联、苯酚单元的邻位选择性氯化和肟酯导向的乙酰氧基化、(-)-螺环素 A 和 C 的对映选择性全合成以及已经实现了 (-)-spiroxin D 的首次全合成。
Oxidative free radical reactions between 2-benzyl-1,4-naphthoquinones and β-dicarbonyl compounds
作者:An-I Tsai、Yi-Lung Wu、Che-Ping Chuang
DOI:10.1016/s0040-4020(01)00754-2
日期:2001.9
Oxidative free radical reactionsbetween 2-benzyl-1,4-naphthoquinones and β-dicarbonyl compounds are described. Electrophilic carbon-centered radicals produced by the manganese(III) acetate or cerium(IV) ammonium nitrate oxidation of β-dicarbonyl compounds undergo efficient addition to a C–C double bond of quinone ring. This free radical reaction provides a novel method for the synthesis of naphthacene-5
2-Substituted 1,4-Naphthoquinones in [6 + 4]-Cycloaddition with 8,8-Dicyanoheptafulvene
作者:Marta Romaniszyn、Katarzyna Gronowska、Łukasz Albrecht
DOI:10.1021/acs.joc.9b01091
日期:2019.8.16
unoccupied molecular orbital reactivity of 2-substituted 1,4-naphthoquinones is possible to be reversed by deprotonation and application of the resulting dienolate as a 4π component in the higher-order [6 + 4]-cycloaddition proceeding in a completely pericyclic manner. 8,8-Dicyanoheptafulvene was shown to be an efficient 6π component in the developed reaction opening the access to functionalized cycloadducts
SHCHERBAN A. I., IZV. VUZOV. XIMIYA I XIM. TEXNOLOGIYA, 1979, 22, HO 3, 290-293
作者:SHCHERBAN A. I.
DOI:——
日期:——
The Application of 2-Benzyl-1,4-naphthoquinones as Pronucleophiles in Aminocatalytic Synthesis of Tricyclic Derivatives
作者:Anna Skrzyńska、Marta Romaniszyn、Dominika Pomikło、Łukasz Albrecht
DOI:10.1021/acs.joc.8b00170
日期:2018.5.4
This study demonstrates an unprecedented reactivity of 2-substituted-1,4-naphthoquinones. By applying the principle of vinylogy, they have been employed as vinylogous pronucleophiles in the organocatalytic cascade reaction for the first time. This novel catalytic activation of 1,4-naphthoquinones enables access to carboannulated naphthalen-1(4H)-one derivatives of biological importance. The site-selectivity