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Synthesis 2006(1): 146-150
DOI: 10.1055/s-2005-921745
DOI: 10.1055/s-2005-921745
PAPER
© Georg Thieme Verlag Stuttgart · New York
Unusually Facile Syntheses of Diquat (6,7-Dihydrodipyrido[1,2-a:2′,1′-c]pyrazinediium) and Related Cations
Further Information
Received
15 June 2005
Publication Date:
16 December 2005 (online)
Publication History
Publication Date:
16 December 2005 (online)
Abstract
A new and versatile method for the synthesis of cyclic diquaternary cations under mild conditions is described. Treatment of various α-diimines with 1,2-bis(triflyloxy)ethane in diethyl ether, chloroform, or dichloromethane at room temperature affords diquats in yields of up to 98%.
Key words
cations - heterocycles - polycycles - diquats - bis(triflyloxy)ethane
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