A Novel and Highly Regioselective Route to Construct Methylthio-Substituted Pyridazines from Aryl Methyl Ketones at Room Temperature
摘要:
A novel and highly regioselective two-step homocoupling/cyclization procedure from easily available aryl methyl ketones and hydrazine hydrate was developed for the synthesis of methylthio-substituted pyridazines at room temperature. The method has remarkable advantages owing to the simple substrates, mild reaction conditions, ease of manipulation, good yields and high regioselectivity.
一种有效的碘介导的二甲基亚砜(DMSO)中碘介导的氧化Pictet-Spengler反应,使用末端炔烃作为2-氧醛替代物来合成芳基(9 H-吡啶并[3,4- b ]吲哚-1-基)甲烷酮。描述。该方案的范围包括法西林蛋白酶,大黄素(Eusoditomins)Y 1和Y 2的总合成。该方法扩展了制备吡咯并[1,2- a ]-喹喔啉和吲哚并[1,5- a ]喹喔啉衍生物的方法。1-芳酰基-β-咔啉的实用性通过执行钯催化的β-咔啉直接邻位得到证明-C(sp2)-H使用DMSO作为来源和访问4-芳基-canthin-6-ones的硫代甲基(SMe)基团对苯环的官能化。
The convergent and linear domino reactions have been first integrated, for the first time, to provide an efficient synthesis of indole–furan conjugates from indoles, methyl ketones, and 1,3-dicarbonyl compounds.
A new route to construct 1,2-dihydroquinoxaline and 1,4-benzoxazine derivatives stereoselectively and its application to novel pyrazolo[1,5-α]quinoxaline oxides
constructed stereoselectively from easily available aryl methyl ketones via a two-step procedure in mild conditions with high yields. Moreover, the application of this reaction provided a convenient approach to novel pyrazolo[1,5-α]quinoxaline oxides.
2-Methylthio-substituted 1,4-enediones, obtained from readily available aryl methyl ketones, were reacted with primary or secondary amines to afford the desired 1,4-diaryl-2-aminobut-2-ene-1,4-diones in excellent yields with high Z/E-stereoselectivity. (C) 2012 Elsevier Ltd. All rights reserved.