[5C + 1S] Annulation: A Facile and Efficient Synthetic Route toward Functionalized 2,3-Dihydrothiopyran-4-ones
摘要:
A facile and efficient synthetic route toward highly substituted 2,3-dihydrothiopyran-4-ones 2 has been developed via a formal [5C + 1S] annulation of readily available alpha-alkenoyl ketene-(S,S)-acetals 1 with sodium sulfide nonahydrated salt (Na(2)S(.)9H(2)O) and utilized in the synthesis of 2-(4-chlorophenyl)-6-(morpholin-4-yl)-4H-thiopyran-4-one 51, an inhibitor of DNA-dependent protein kinase (DNA-PK).
FeCl3·6H2O-Catalyzed Tandem Alkylation–Hydrolysis Reaction of Chain α-Oxo Ketene Dithioacetals with Alcohols: Efficient Synthesis of α-Alkylated β-Oxo Thioesters
A novel FeCl3·6H2O-catalyzed tandem Friedel–Crafts alkylation–hydrolysis reaction between chain α-oxo ketene dithioacetals and alcohols to afford α-alkylated β-oxo thioesters has been successfully developed. The reaction is efficient in the presence of catalyst loading as low as 30 mol% in MeCN at roomtemperature, and a wide variety of α-alkylated β-oxo thioesters are efficiently synthesized in good
ABSTRACT In this paper, we wish to report an environment friendly synthetic method for β-ketothioesters from a dodecylbenzenesulfonic acid (DBSA)-catalyzed hydrolysis reaction of chain α-oxo ketenedithioacetals in water. It was shown that the hydrolysis reaction of chain α-oxo ketenedithioacetals could efficiently occur in the presence of 7.5 mol% DBSA at 100 °C in water, affording the desired β-keto
摘要在本文中,我们希望报告一种环境友好的β-酮硫酯合成方法,该方法由十二烷基苯磺酸(DBSA)催化链α-氧代烯酮二硫代缩醛在水中的水解反应。结果表明,在 7.5 mol% DBSA 的存在下,在 100 °C 的水中链 α-氧代烯酮二硫缩醛的水解反应可以有效地发生,以优异的产率提供所需的 β-酮硫酯。图形概要