中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | N-(aminothioxomethyl)-5,6-dihydro-2-methyl-1,4-oxathiin-3-carboxamide | 75603-70-2 | C7H10N2O2S2 | 218.301 |
—— | O-methyl-S-phenylmethyl-N-(5,6-dihydro-2-methyl-1,4-oxathiin-3-yl)carbonyl carbonimidothioate | 78978-73-1 | C15H17NO3S2 | 323.437 |
—— | methyl 1-[(4-chlorophenyl)methylsulfanyl]-N-(6-methyl-2,3-dihydro-1,4-oxathiine-5-carbonyl)methanimidate | 78978-77-5 | C15H16ClNO3S2 | 357.882 |
—— | O-methyl-(5,6-dihydro-2-methyl-1,4-oxathiin-3-yl)carbonyl carbamothioate | 78979-00-7 | C8H11NO3S2 | 233.312 |
—— | 6-methyl-N-(propan-2-ylcarbamothioyl)-2,3-dihydro-1,4-oxathiine-5-carboxamide | 75603-71-3 | C10H16N2O2S2 | 260.381 |
—— | N-(butylcarbamothioyl)-6-methyl-2,3-dihydro-1,4-oxathiine-5-carboxamide | 75603-72-4 | C11H18N2O2S2 | 274.408 |
—— | N-(hexylcarbamothioyl)-6-methyl-2,3-dihydro-1,4-oxathiine-5-carboxamide | 75603-73-5 | C13H22N2O2S2 | 302.462 |
—— | 6-methyl-N-(octylcarbamothioyl)-2,3-dihydro-1,4-oxathiine-5-carboxamide | 75603-74-6 | C15H26N2O2S2 | 330.516 |
—— | N-(dimethylaminocarbamothioyl)-6-methyl-2,3-dihydro-1,4-oxathiine-5-carboxamide | 75603-76-8 | C9H15N3O2S2 | 261.369 |
The amides prepared from 5,6-dihydro-2-methyl-1,4-oxathiin-3-carbonyl chloride 2 and imidamides 4, carbamimidothioates 4, 2-benzimidazolamine 7, 2-benzothiazolamine 12, and 2-thiazolamine have been studied. The reaction of 2 with imidamides 4 and with carbamimidothioates 4 in the presence of base gave the amides 5, which when heated in toluene underwent the 1,4-oxathiin ring opening and rearrangement to produce 2-substituted-5-[(2-hydroxyethyl)thio]-6-methyl-4(1H)-pyrimidinones 6. Acylation of 2-benzimidazolamine 7 with 2 yielded the amide 10. This, in boiling ethanol, ring opened and rearranged to give the compound 11. The reaction of 2-benzothiazolamine 12 with 2 gave the rearrangement product 14 directly and neither of the possible amides 13 and 15 could be detected. The amide 15 was synthesized by an unambiguous route from 2-aminobenzenethiol and 5,6-dihydro-2-methyl-1,4-oxathiin-3-carbonyl isothiocyanate 3. It would not undergo ring opening and rearrangement when heated. Acylation of 2-thiazolamine with 2 yielded a mixture from which the amide 19 and the rearrangement ester 18 were separated. Structural assignments are based mainly on nmr, uv, and ir spectral evidence.