New short step general synthesis of isobenzofuran-1(3H)-ones (phthalides) based on a single or double β-scission of alkoxyl radicals generated from 1-ethyl-benzocyclobuten-1-ols and from 1,3-dihydroisobenzofuran-1-ols; synthesis of some natural phthalides
New general methods are described for the synthesis of phthalides, 3-monosubstituted, and 3,3-disubstituted phthalides including naturally-occurring phthalides such as pierardine based on a regioselective single or double β-scission of the alkoxyl radicals generated by the photolysis of the hypoiodites of 1-ethyl benzocyclobuten-1-ols or 1,2-catacondensed benzocyclobuten-1-ols or 1,3-dihydro-1,3-a
A simple new method for the synthesis of phthalides and their 3-alkyland 3,3′-spiroalkyl derivatives including (±)-3-butylphthalide, a racemic form of a constituent of celery oil, through the β-scission of alkoxyl radicals generated from hypoiodites of benzocyclobutenols by the photolysis, is described.
Hydroiodination-Triggered Cascade Reaction with I<sub>2</sub>
/PPh<sub>3</sub>
/H<sub>2</sub>
O: Metal-Free Access to 3-Substituted Phthalides from 2-Alkynylbenzoates
synthesis of phthalides are strongly desired. Herein, we describe the metal-free synthesis of 3-substituted phthalides by the reductive hydroiodination of 2-alkynylbenzoates through an I2/PPh3/H2O-triggered cascade reaction. A variety of 3-substituted phthalides were synthesized in excellent yields by a one-pot reaction involving four processes: desilylation, hydroiodination, cyclization, and reduction.
邻苯二甲酰胺是在几种生物活性化合物中发现的重要支架。因此,强烈需要有效的合成邻苯二甲酰亚胺的方法。在这里,我们描述了通过I 2 / PPh 3 / H 2 O引发的级联反应,通过2-炔基苯甲酸酯的还原性加氢碘化反应,合成了无金属的3-取代的邻苯二甲酸酯。通过一锅法反应,涉及四个过程:去甲硅烷基化,加氢碘化,环化和还原反应,以优异的产率合成了多种3-取代的邻苯二甲酸酯。
Palladium-Catalyzed Direct Oxidative Coupling of Iodoarenes with Primary Alcohols Leading to Ketones: Application to the Synthesis of Benzofuranones and Indenones
investigated, utilizing readily available primary alcohols as acylating sources. Overall, this oxidative coupling proceeds via three distinct transformations such as oxidation, radical formation, and cross-coupling in one catalytic process. This protocol does not involve the assistance of a directing group or activation of the carbonyl group by any other means. Furthermore, this reaction made use of no
2-Methylchromone derivatives and their preparation process
申请人:Eisai Co., Ltd.
公开号:EP0114899A1
公开(公告)日:1984-08-08
A novel 2-methylchromone derivative represented by the general formula:
wherein R, means a hydrogen atom or a lower alkanoyl group. The above derivative is a useful intermediate for the synthesis of cephem activities, which are also effective against infections of the urinary tract. etc. A preparation process of the above chromone derivative is also disclosed.
一种新型 2-甲基铬酮衍生物,其通式如下: 其中 R 指氢原子或低级烷酰基。 上述衍生物是合成头孢活性物质的有用中间体,对泌尿道感染等也有效。