preparation of 3-substitutedbenzo[b]thiophenes was developed. α-Substituted 2-(1-phenylethylthio)styrenes, which could easily be prepared from 2-mercaptophenyl ketones or benzenethiols in two or three steps, respectively, underwent 5-endo cyclization on treatment with iodine in the presence of sodium hydrogencarbonate in acetonitrile at room temperature to give 3-substitutedbenzo[b]thiophenes in fair to
A convenient synthesis of 3-arylbenzo[b]thiophenes utilizing an interrupted Pummerer reaction of 2-(1-arylvinyl)phenyl ethyl sulfoxides is described. Thus, treatment of these sulfoxides, which were readily prepared from 2-sulfanylphenyl ketones or 2-fluoro-5-methoxybenzaldehyde, with acetic anhydride at 100 °C afforded 3-arylbenzo[b]thiophenes in reasonable yields.
描述了利用2-(1-芳基乙烯基)苯基乙基亚砜的间断Pummerer反应方便地合成3-芳基苯并[ b ]噻吩的方法。因此,在100℃下用乙酸酐处理由2-硫烷基苯基酮或2-氟-5-甲氧基苯甲醛容易制备的这些亚砜,以合理的收率得到了3-芳基苯并[ b ]噻吩。
An efficient synthesis of 3-aryl-2-aryl(or methyl)sulfanylbenzo[b]thiophenes via cyclization of aryl 2-aryl(or methyl)sulfanylmethylsulfanylphenyl ketones
convenient method for the preparation of 2-aryl(or methyl)sulfanylbenzo[b]thiophenes has been developed. Thus, aryl 2-aryl(or methyl)sulfanylmethylsulfanylphenyl ketones, easily prepared from readily available aryl 2-sulfanylphenyl ketones or 2-chloro-5-nitrophenyl phenyl ketone, are treated with LDA in 1,2-dimethoxyethane (DME) to give 3-aryl-2-aryl(or methyl)sulfanylmethylsulfanyl-2,3-dihydrobenzo[b]thiophen-3-ols
已经开发了一种方便的制备2-芳基(或甲基)硫烷基苯并[ b ]噻吩的方法。因此,将易于由易得的芳基2-硫烷基苯基酮或2-氯-5-硝基苯基苯基酮制得的芳基2-芳基(或甲基)硫烷基甲基硫基苯基酮在1,2-二甲氧基乙烷(DME)中用LDA处理,得到3 -芳基-2-芳基(或甲基)硫烷基甲基硫基-2,3-二氢苯并[ b ]噻吩-3-醇,然后用亚硫酰氯脱水,得到3-芳基-2-芳基(或甲基)硫烷基苯并[ b]噻吩的总产量合理。
One-Pot Synthesis of 2,3-Disubstituted Benzo[b]thiophene Derivatives from 2-Mercaptophenyl Ketones
2-Mercaptopheryl ketones have been found to react with activated alkyl bromides (BrCH(2)EWG's), such as bromoacetates, bromoacetonitrile, and bromomethyl phenyl ketone, in the presence of two molar amounts of sodium hydride in THF at 0 degrees C to afford 2,3-disubstituted benzo[b]thiophenes in generally good to excellent yields.
One-Pot Synthesis of 12-Hydroxy-12<i>H</i>-benzo[<i>b</i>]thioxanthene-6,11-diones from 1,4-Naphthoquinone and<i>o</i>-Acylbenzenethiols
The title benzo[b]thioxanthenequinone derivatives could be prepared in one-pot via a sequential conjugate addition and an aldol-type reaction between 1,4-naphthoquinone and o-acylbenzenethiols, followed by oxidation with 1,4-naphthoquinone or air.