Substituted 2-Methylene-1,3-oxazolidines, -1,3-thiazolidines, -1,3-benzothiazines, -1,3-oxazines, and Substituted Imidazopyrimidinediones from Cl(CH<sub>2</sub>)<i><sub>n</sub></i>NCO and Cl(CH<sub>2</sub>)<i><sub>n</sub></i>NCS and Active Methylene Compounds
作者:Ahmad Basheer、Zvi Rappoport
DOI:10.1021/jo061835g
日期:2006.12.1
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