3-oxazolidines. Reaction of cyanoacetamide with 3 in the presence of Na gave a tricyclic triaza(thia)indacene, derived from two molecules of 3. A reaction mechanism involving an initial attack of the anion 1- on the NCX (X = O, S) moiety gives an anion 18, which cyclizes intramolecularly and after tautomerization gives the mono-ring heterocycle. With the cyanoamides, the N- site of the ambident ion 18 attacks
ω-
氯代的反应异
氰酸氯(CH 2)ñ NCO(Ñ = 2(2),3(4))和异
硫氰酸酯氯(CH 2)2
NCS(3)与活性亚甲基化合物CH 2 YY” 1在的存在的Et 3 N或
钠得到2- YY'亚甲基-
1,3-恶唑烷,(ê,ž)-1,3-
噻唑烷,1,3-恶嗪从2,3,和4,分别。2-(
氯甲基)苯基
异氰酸酯8给出1相应的苯并恶嗪。2-异
硫氰酸根合
苯甲酸乙酯10得到相应的
苯并噻唑啉酮,而类似的
异氰酸酯12得到非环状烯醇。乙氧羰基异
硫氰酸酯14得到开链的
硫烯醇或烯醇-
硫酰胺。所述cyanoamides CH 2(CN)CONHR,R = H,Me中,CHPh配合2,用Et给予3 N和2的双环imidazopyrimidinediones 16,从两个分子衍生的2,但与它们预先形成的Na盐他们得到
1,3-恶唑烷。
氰基乙酰胺与3的反应在Na的存在下,生成了一个
三环三氮杂并(thia)
茚并四烯,其衍