Three-Step Synthesis of 3-Aryl-2-sulfanylthieno[2,3-<i>b</i>]-, -[2,3-<i>c</i>]-, or -[3,2-<i>c</i>]pyridines from the Corresponding Aryl(halopyridinyl)methanones
作者:Kazuhiro Kobayashi、Teruhiko Suzuki、Yuko Egara
DOI:10.1002/hlca.201200123
日期:2013.1
din‐3‐yl}methanones 2. In the second step, these were treated with LDA (LiNiPr2) to give 3‐aryl‐2,3‐dihydro‐2‐sulfanylthieno[2,3‐b]pyridin‐3‐ols 3, which were dehydrated in the last step with SOCl2 in the presence of pyridine to give the desired products. Similarly, thieno[2,3‐c]pyridine and thieno[3,2‐c]pyridine derivatives, 8 and 12, respectively, can be prepared from aryl(3‐chloropyridin‐4‐yl)methanones
已经开发了一种方便的三步程序,用于合成三种类型的3芳基2硫烷基噻吩并吡啶4、8和12。噻吩并[2,3- b ]吡啶衍生物4的合成的第一步是用Na 2连续处理将芳基(2-卤代吡啶-3--3-基)甲烷1中的(磺酰基甲基)硫烷基取代卤素。用S⋅9H 2 O和氯甲基硫化物制得芳基2-[[(硫烷基甲基甲基)硫烷基]吡啶-3-基}甲酮2。在第二步中,将它们用LDA(LiN i Pr 2)处理,得到3-芳基-2,3-二氢-2-磺酰苯并[2,3- b] pyridin-3-ols 3,最后一步在吡啶存在下用SOCl 2脱水,得到所需的产物。同样,噻吩并[2,3- c ]吡啶和噻吩并[3,2- c ]吡啶衍生物8和12可以分别由芳基(3-氯吡啶-4-基)甲酮5和芳基(4-氯吡啶-3-基)甲烷9。