[4+2] Cycloaddition Reactions between 2,4-Diamino-1-thia-3-azabutadienes and Ketene. Synthesis of New 1,3-Thiazin-6-ones, 1,3-Thiazine-6-thiones and 2-Thioxopyrimidin-4-ones
[4+2] Cycloaddition Reactions between 2,4-Diamino-1-thia-3-azabutadienes and Ketene. Synthesis of New 1,3-Thiazin-6-ones, 1,3-Thiazine-6-thiones and 2-Thioxopyrimidin-4-ones
作者:Jean Claude Meslin、Cyrille Landreau、David Deniaud、Françoise Reliquet、Alain Reliquet
DOI:10.3987/com-00-9023
日期:——
2,4-DIAMINO-1-THIA-3-AZABUTADIENES, INTERMEDIATES IN HETEROCYCLIC SYNTHESIS
作者:C. Friot、A. Reliquet、F. Reliquet、J. C. Meslin
DOI:10.1080/10426500008044998
日期:2000.1
Abstract 2,4-Diamino-1-thia-3-azabutadienes 1 were studied. Methylation occured at sulfur and acylation at nitrogen bound to the 2 position. Alkylation by α-bromoketones gave rise to 2-amino-5-acylthiazoles. Upon treatment with acrylic dienophiles compounds 1 reacted either as diazadiene or as thiazadiene yielding tetrahydropyrimidinethiones or 6H-1,3-thiazines respectively.