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.
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.