139507-52-1Relevant articles and documents
Synthesis of tetrasubstituted pyridines by the acid-catalysed Bohlmann-Rahtz reaction
Bagley, Mark C.,Brace, Christian,Dale, James W.,Ohnesorge, Maren,Phillips, Nathan G.,Xiong, Xin,Bower, Justin
, p. 1663 - 1671 (2002)
New facile experimental procedures for the preparation of 2,3,4,6-tetrasubstituted pyridines in a single synthetic step have been developed. Thus, an enamino ester and alkynone react by Michael addition-cyclodehydration in a heterocyclisation process that is catalysed by acetic acid, Amberlyst 15 ion exchange resin, zinc(II) bromide or ytterbium(III) triflate. The new one-step Bronsted or Lewis acid-catalysed Bohlmann-Rahtz reaction is a simple, direct and highly expedient method for the synthesis of pyridines that proceeds at a lower reaction temperature and avoids the need to isolate reaction intermediates.
Asymmetric “Acetylenic” [3+2] Cycloaddition of Nitrones Catalyzed by Cationic Chiral PdII Lewis Acid
Honda, Kazuya,Mikami, Koichi
supporting information, p. 2838 - 2841 (2018/09/14)
Highly enantioselective [3+2] cycloaddition of ynones and nitrones has been developed. Very bulky ligand, DTBM-SEGPHOS, was used for an effective asymmetric induction over distal reaction centers on the linear ynone dipolarophile and for prevention of PdII catalyst deactivation by coordination of the nitrones. The reaction has wide scope of substrates in both ynones and nitrones.
Novel pyrazinone derivatives
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Page/Page column 46, (2010/01/31)
The present invention relates to a compound of the general formula (I): 1 [Ar1 is aryl fused to the adjacent pyrazinone ring at the 5th and 6th positions, etc., X is CO, etc., Y is CH, etc., Z is CH, etc., V is CH, etc., Wn is —(CH2)n— (n is zero to four)