所述的合成顺式-3a,8b的二氢呋喃并[3,2- b ]苯并呋喃-2(3 H ^) -酮环系统经由一个环Furofuran型活化的苯醌
摘要:
将未催化的2-(三甲基甲硅烷氧基)呋喃(4)加至在C-2处具有吸电子基团的1,4-苯醌(5a - e)得到顺式-3a,8b-二氢呋喃[3,2- b ]苯并呋喃2(3 H)-ones (6a – e)的产率为51–76%。在C-2处没有吸电子基团的1,4-苯醌(5f,g,h)不能进行呋喃呋喃环化,没有分离出任何所需的加合物(6f,g,h)。羧酸加合物(6i ; R = CO 2H)是通过在乙酸中使用锌将苯甲酰加合物(6e)或三氯乙基酯加合物(6d)还原水解而间接制备的。用酸处理甲基酮加合物(6b)使相应的(苯并呋喃-2-基)乙酸(9)开环。
‘On water’: unprecedented nucleophilic substitution and addition reactions with 1,4-quinones in aqueous suspension
作者:Vishnu K. Tandon、Hardesh K. Maurya
DOI:10.1016/j.tetlet.2009.07.149
日期:2009.10
Unique nucleophilicsubstitution and additionreactions of 1,4-quinones in aqueous suspension with aromatic amines, primary aliphatic amines, amino acid, ester of amino acid, heterocyclic amines, hydrazine, amide, and thioethers are described in absence of catalyst against the traditional synthetic routes of these reactions in non-aqueous medium in presence of catalyst.
Copper and triphenylphosphine-promoted sulfenylation of quinones with arylsulfonyl chlorides
作者:Xiaoli Yu、Qiujin Wu、Huida Wan、Zhaojun Xu、Xingle Xu、Dawei Wang
DOI:10.1039/c6ra11301j
日期:——
The efficient copper and triphenylphosphine-promoted sulfenylation of quinones with arylsulfonyl chlorides has been developed under mild conditions with moderate to good yields. Significantly, this provides an alternative method to synthesise arylthioquinone derivatives. This is the first time that arylthioquinones with arylsulfonyl chlorides as starting material have been prepared, which avoids the
Unified Synthesis of Quinone Sesquiterpenes Based on a Radical Decarboxylation and Quinone Addition Reaction
作者:Taotao Ling、Erwan Poupon、Erik J. Rueden、Sun H. Kim、Emmanuel A. Theodorakis
DOI:10.1021/ja027517q
日期:2002.10.1
several quinone sesquiterpenes is described herein. Essential to this strategy is a novel radical additionreaction that permits the attachment of a fully substituted bicyclic core 16 to a variably substitutedquinone 10. The addition product 15 can be further functionalized, giving access to natural products with a high degree of oxygenation at the quinone unit. The quinoneadditionreaction is characterized
Oxidative radical coupling of hydroquinones and thiols using chromic acid: one-pot synthesis of quinonyl alkyl/aryl thioethers
作者:T. P. Adarsh Krishna、Sakthivel Pandaram、Suresh Chinnasamy、Andivelu Ilangovan
DOI:10.1039/d0ra01519a
日期:——
An efficient, simple and practical protocol for one-pot sequential oxidative radical C–H/S–H cross-coupling of thiols with hydroquinones (HQs) and oxidation leading to the formation of quinonyl alkyl/aryl thioethers using H2CrO4 was developed. This cross-coupling of thiyl and aryl radicals offers mono thioethers in good to moderate yield and works well with a wide variety of thiols. Similarly, this
Efficient Synthesis of Aminonaphthoquinones and Azidobenzohydroquinones: Mechanistic Considerations of the Reaction of Hydrazoic Acid with Quinones. An Overview
作者:Elias A. Couladouros、Zoi F. Plyta、Serkos A. Haroutounian、Vassilios P. Papageorgiou
DOI:10.1021/jo9614708
日期:1997.1.1
Parameters useful to predict and control the reaction outcome of conjugate addition of hydrazoicacid to quinones have been studied, and the optimum conditions for the efficient synthesis of aminonaphthoquinones and azidobenzohydroquinones are reported. The application of this reaction for the efficient formal synthesis of dephostatin is also presented.