喹唑啉稠合螺杂环化合物的合成及晶体结构

The new fused quinazoline spiro-heterocyclic compounds were synthesized by combining the fused thiazolidone and quinazoline structure with spiro-heterocyclic structure for the purpose to get novel bio-active compounds. Dipolar azomethine ylides reacted with dipolarphile 2-arylmethylene-9-benzylidene-5-phenyl-6,7,8,9-tetrahydro-5H-thiazolo[2,3-b]quinazoline-3-one via 1,3-dipolar cycloaddition to give nine fused quinazoline spiro-heterocyclic compounds. The configuration and conformation of the products were determined by elementary analysis, 1H NMR, IR and X-ray crystal analysis. The results also revealed that the reaction was stereospecific.

1,3-偶极环加成反应在杂螺环化合物合成中的应用

氧化腈与４，４－亚甲基－１－甲基哌啶的１，３－偶极环加成反应生成了杂螺［４．５］葵烷化合物，反应具有立体专一性．产物经ＬｉＡｌＨ４还原生成了γ－氨基醇，最后经插入Ｃ－１单元扩环生成了新的杂螺［５．

新型顺-1,3-二芳基螺[吡唑-4,2'-吡唑并[1,2-a]吡唑]衍生物的非对映选择性合成

在三乙胺催化下,环偶氮甲亚胺与4-芳亚基-5-甲基-2-苯基吡唑-3-酮在乙腈中回流反应,经1,3-偶极环加成反应合成了13个新型的1,3-二芳基取代的螺[吡唑-4,2'-吡唑并[1,2-a]吡唑]衍生物(3a^3m),其结构经~1H NMR,^(13)C NMR,IR和HR-MS(ESI)表征。采用X-射线单晶衍射研究了3d,3h,3j和3l的单晶结构。结果表明:3为特殊的顺式-1,3-二芳基构型。