2,5-Bis-(sulfonyl)pyrazines as unprecedented building blocks and their SNAr reactions
摘要:
Previously unknown 2,5-bis-sulfonylpyrazines are prepared and their SNAr reactions are investigated. When 2 equiv of thiols are employed, the corresponding bis-thiopyrazines are obtained exclusively. However, phenols or alkoxides gave rise to only the corresponding mono-substituted aryloxy- or alkoxy-sulfonylpyrazines in excellent yields. A carbon nucleophile prepared by treating malonate with NaH also produced the corresponding mono-sulfonylpyrazines. Aliphatic amines and anilines only provided the mono-anilino-sulfonylpyrazines in poor to moderate yields. (c) 2013 Elsevier Ltd. All rights reserved.
cyclopropylmethylthio groups can be easily introduced into the aromatic rings from the corresponding S-[2-(dimethylamino)ethyl]isothiourea dihydrochloride and S-cyclopropylmethylisothiourea hydrobromide. The possible reaction mechanism is proposed. It is believed that this route to aryl alkyl sulfides is well competitive with currently known methods due to its wide substrate scope, excellent yields, easy
An air-stable microwire radial heterojunction with high photoconductivity based on a new building block
作者:Jianfeng Zhang、Jinshan Wang、Xinjun Xu、Shiyan Chen、Qinglin Zhang、Chuang Yao、Xiujuan Zhuang、Anlian Pan、Lidong Li
DOI:10.1039/c5tc01050k
日期:——
(dithienopyrazine) and utilized it as a shell material to construct organic 1D radial p–nheterojunctions. This p-type compound shows a higher oxidation potential and is more resistant to photooxidation in air than its analogs with the commonly-used benzodithiophene unit. Moreover, we prepared organic microwires with radial heterojunctions via a solution-processed method by self-assembly of our p-type material
Dithio- und Thionester, 54. Mitt.: Versuche zur Darstellung von α-Aminodithiosäureestern mit der Bislactimether-Methode
作者:Klaus Hartke、Andreas Brutsche
DOI:10.1002/ardp.19933260202
日期:——
5‐Piperazindithion (8) und nicht Glycindithiomethylester (6). Die durch Alkylieren von 5 erhaltenen Iminiumsalze 9 werden von H2S in die 1,4‐Dialkyl‐2,5‐piperazindithione 10 übergeführt. 5 bildet mit Chlorameisensäuremethylester 2,5‐Bis(methylthio)‐pyrazin (11) undmit Acetanhydrid das 1,4‐Dihydropyrazin 12. Die Sulfhydrolyse der6‐ und 7‐Ring‐Iminiumsalze 14 führt zu den Thiolactamen 15.
2,5-Bis-(sulfonyl)pyrazines as unprecedented building blocks and their SNAr reactions
作者:Jie Jack Li、Wei Meng、Shung Wu、Yong-Jin Wu、Jason Guernon、Martin P. Allen、Michael M. Miller、Peter T. Cheng、Bang-chi Chen
DOI:10.1016/j.tetlet.2013.01.106
日期:2013.4
Previously unknown 2,5-bis-sulfonylpyrazines are prepared and their SNAr reactions are investigated. When 2 equiv of thiols are employed, the corresponding bis-thiopyrazines are obtained exclusively. However, phenols or alkoxides gave rise to only the corresponding mono-substituted aryloxy- or alkoxy-sulfonylpyrazines in excellent yields. A carbon nucleophile prepared by treating malonate with NaH also produced the corresponding mono-sulfonylpyrazines. Aliphatic amines and anilines only provided the mono-anilino-sulfonylpyrazines in poor to moderate yields. (c) 2013 Elsevier Ltd. All rights reserved.