- Intermolecular and intramolecular cycloaddition reactions of 1-ethyl-1,2,4-triazinium salts with alkynes
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Azomethyne ylides generated from 3-alkylthio substituted 1-alkyl-5-aryl-1,2,4-triazinium salts 4a-c on treatment with triethylamine undergo 1,3-dipolar cycloaddition with dimethyl acetylenedicarboxylate to give pyrrolo[2,1-f][1,2,4]triazines, while 1-ethy
- Mochulskaya,Andreiko,Charushin,Shulgin,Raikov,Solomonov
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- REACTIVITY OF 3-ALKYNYLTHIO-1-ETHYL-1,2,4-TRIAZINIUM SALTS IN INTRAMOLECULAR DIELS-ALDER REACTION
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Quaternization of 3-(3-butynylthio) and 3-(4-pentynylthio) substituted 1,2,4-triazines with triethyloxonium tetrafluoroborate in CH2Cl2 at room temperature occurs exclusively at N-1 yielding 3-alkynylthio-1-ethyl-1,2,4-triazinium salts, as unequivocally s
- Charushin, N. Valery,Veldhuizen, Beb van,Plas, Henk C. van der,Stam, Casper H.
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p. 6499 - 6510
(2007/10/02)
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- Intramolecular Diels-Alder Reactions of 1,2,4-Triazines. A Facile Synthesis of Thienopyridines and 3,4-Dihydro-2H-thiopyranopyridines
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Thienepyridines and 3,4-dihydro-2H-thiopyranopyridines have been prepared in high overall yields via intramolecular Diels-Alder reactions of properly substituted 1,2,4-triazine derivatives.A one-pot synthesis of 2,3-dihydrothienopyrid
- Taylor, Edward C.,Macor, John E.
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p. 4280 - 4287
(2007/10/02)
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- NOVEL INTRAMOLECULAR DIELS-ALDER REACTIONS WITH ALKYNYLTHIO DERIVATIVES OF 1,2,4-TRIAZINES. NEW ROUTES TO THIENOPYRIDINES AND THIENOPYRIDINES
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S-Alkylation of 1,2,4-triazine-6-thiones with 4-iodobutyne, followed by oxidation to the sulfoxide and intramolecular cycloaddition (at room temperature), gives 2,3-dihydrothienopyridines, which are readily dehydrated with acetic anhydride to thien
- Taylor, Edward C.,Macor, John E.
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p. 2419 - 2422
(2007/10/02)
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