- 1,3-Oxazines and Related Compounds. XIV. Facile Synthesis of 2,3,6-Trisubstituted 2,3-Dihydro-1,3-oxazine-5-carboxilyc Acids and 1,4-Disubstituted 3-Acyl-β-lactams from Acyl Meldrum's Acids and Schiff Bases
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Simple preparation of 2,3,6trisubstituted 2,3-dihydro-1,3-oxazine-5-carboxylic acids (4) and 1,4-disubstituted 3-acyl-β-lactams (5) from acyl Meldrum's acids and Schiff bases were carried out.2,3-Disubstituted 5-acyl-3,4,5,6-tetrahydro-2H-1,3-oxazine-4,6-
- Yamamoto, Yutaka,Watanabe, Yokiyoshi
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p. 1871 - 1879
(2007/10/02)
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- 1,3-Oxazines and Related Compounds. XIII. Reaction of Acyl Meldrum's Acids with Schiff Bases Giving 2,3-Disubstituted 5-Acyl-3,4,5,6-tetrahydro-2H-1,3-oxazine-4,6-diones and 2,3,6-Trisubstituted 2,3-Dihydro-1,3-oxazin-4-ones
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The reaction of Schiff bases (2) with various acyl Meldrum's acids (1) were investigated.Refluxing of 1 and 2 in benzene caused an exchange reaction of the acetone moiety of 1 with the Schiff base moiety through the intermediate acylketenes 11 formed in s
- Yamamoto, Yutaka,Watanabe, Yukiyoshi,,Ohnishi, Shuhei
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p. 1860 - 1870
(2007/10/02)
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- Reaction of 2,2,6-trimethyl-1,3-dioxin-4-one with Imines
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The reaction of 2,2,6-trimethyl-1,3-dioxin-4-one (diketene-acetone adduct) (1) with imines was investigated.Heating of the adduct 1 with N-(1-phenylethylidene)aniline (6a) gave 6-methyl-1,2-diphenyl-4(1H)-pyridone 7a.Similar treatment of N-benzylideneanil
- Masayuki, Sato,Ogasawara, Hiromichi,Yoshizumi, Eriko,Kato, Tetsuzo
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p. 1902 - 1909
(2007/10/02)
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- REACTION OF 2,2,6-TRIMETHYL-1,3-DIOXIN-4-ONE WITH SCHIFF BASE
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Heating of 2,2,6-trimethyl-1,3-dioxin-4-one (1) with Schiff bases (2a-f) gave 2,3-disubstituted 6-methyl-1,3-oxazin-4-ones (4a-f).N-Benzylidene-tert-butylamine, under the similar condition, gave acetoacetamide derivative (3g) and acetylazetidinone derivative (5).
- Sato, Masayuki,Ogasawara, Hiromichi,Yoshizumi, Eriko,Kato, Tetsuzo
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p. 297 - 300
(2007/10/02)
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