formaldehyde under mild conditions to afford pyrimido[6,1- b ][1,3,5]thiadiazine derivatives in moderate yields. Furthermore, 2-cyano-2-cyclohexylideneethanethioamide reacted in the similar Mannich -type manner to give spiro-conjugated pyrimido-1,3,5-thiadiazines. The structure of 3,7-dibenzyl-8-(fur-2-yl)-3,4,7,8-tetrahydro-2 H ,6 H -pyrimido[6,1- b ][1,3,5]thiadiazine-9-carbonitrile was determined
3-(Het)芳基-2-
氰基丙-2-烯
硫酰胺在温和条件下易于与
伯胺和过量
甲醛反应,以中等收率得到
嘧啶并[6,1- b ] [1,3,5]噻二嗪衍
生物。此外,2-
氰基-2-环己 叉基乙
硫基酰胺以相似的曼尼希 型反应, 得到螺环共轭的
嘧啶基-1,3,5-噻二嗪。3,7-二苄基-8-(
呋喃-2-基)-3,4,7,8-四氢-2 H ,6 H-
嘧啶基[6,1- b ] [1,3,5]的结构通过X射线衍射分析确定噻二嗪-9-腈。