divergolides 是结构上前所未有的 ansa 大环化合物家族。我们描述了一种针对 divergolides C 和 D 的合成策略,该策略取决于常见中间体的仿生多样化。介绍了一种先进的前体,它包含了 divergolide C 和 D 的所有碳原子,并研究了空间拥挤的酰基萘中的阻转异构现象。
Two Approaches to the Aromatic Core of the Aminonaphthoquinone Antibiotics
作者:Christopher C. Nawrat、Leoni I. Palmer、Alexander J. Blake、Christopher J. Moody
DOI:10.1021/jo400737f
日期:2013.6.7
Two complementary approaches are presented for the synthesis of the quinone chromophores of the naphthoquinone ansamycins and related natural products. The first involves the use of an improved protocol for the manganese(III) acetate mediated cyclization of 5-aryl-1,3-dicarbonyl compounds to β-naphthols, leading to the simple, scalable preparation of building blocks suitable for the synthesis of naturally
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
Studies towards the total synthesis of hygrocins A and B
作者:Sivappa Rasapalli、Gopalakrishna Jarugumilli、Gangadhara Rao Yarrapothu、Hamza Ijaz、James A. Golen、Paul G. Williard
DOI:10.1016/j.tetlet.2013.12.017
日期:2014.1
studies lay the platform for the determination of the absolute configuration of the unassigned C8-stereocenter of the title compounds in addition to the completion of the totalsynthesis of the unique ansamacrolides hygrocins A and B.
Synthesis of 2,3-Dialkyl-5-hydroxybenzofurans via a One-pot, Three-step Reaction Sequence of 2-Monosubstituted 1,3-Diketones and 1,4-Benzoquinones
作者:Qing Dong、Yu-Huan Yang、Xue-Jiao Lv、Jia-Hui Liu、Yan-Kai Liu
DOI:10.1021/acs.joc.4c00511
日期:2024.5.17
An economical one-pot, three-step reaction sequence of readily available 2-monosubstituted 1,3-diketones and 1,4-benzoquinones has been explored for the facile access of 2,3-dialkyl-5-hydroxybenzofurans. By using cheap K2CO3 and conc. HCl as the reaction promoters, the reaction occurs smoothly via sequential Michael addition, aromatization, retro-Claisen, deacylation, hemiketalization, and dehydration
为了方便地获得 2,3-二烷基-5-羟基苯并呋喃,我们探索了一种经济的一锅三步反应序列,由容易获得的 2-单取代 1,3-二酮和 1,4-苯醌组成。通过使用廉价的 K 2 CO 3和浓缩物。以HCl为反应促进剂,通过连续的迈克尔加成、芳构化、逆克莱森、脱酰化、半缩酮化和脱水等过程,反应在温和条件下顺利进行,实用性强。此外,在衍生化研究过程中观察到一个有趣的现象,其中二氢喹啉通过歧化过程分别转化为四氢喹啉和喹啉产物。
An Approach to Aminonaphthoquinone Ansamycins Using a Modified Danishefsky Diene
作者:Christian A. Kuttruff、Simon Geiger、Mesut Cakmak、Peter Mayer、Dirk Trauner
DOI:10.1021/ol203437a
日期:2012.2.17
A robust and scalable synthesis of a novel, cyano-substituted Danishefsky-type diene and its use in the Diels-Alder reaction with various dienophiles is reported. The diene allows for the rapid construction of highly substituted aminonaphthoquinones that occur in numerous ansamycin antibiotics.