Preparation of uracil by cycloreversion. Structure of cycloalkane/ene- and norbornane/ene-fused dihydrouracils
作者:Samuel Frimpong-Manso、Katalin Nagy、Géza Stájer、Gábor Bernáth、Pál Sohár
DOI:10.1002/jhet.5570290140
日期:1992.1
formed from trans-4-cyclohexene-1-carboxylate, furnished the cis-fused 5,6-dihydropyrimidine-2,4(1H,3H)-dione. On heating, the norbornene-diexo-fused dihydrouracil 16 yielded 2,4-pyrimidinedione through the splitting-off of cyclopentadiene. The structures of the compounds were proved by 1H and 13C nmr spectroscopy.
2-氨基-1-环烷烃,环烯烃,降冰片烷和降冰片烯羧酸酯1–9与氰酸钾的反应生成脲酯,然后将其酯化成环烷烃,环烯,降冰片烷和降冰片烯稠合的5,6-。二氢尿嘧啶10-17。在环化中,由反式-4-环己烯-1-羧酸酯形成的脲酯提供了顺式稠合的5,6-二氢嘧啶-2,4(1 H,3 H)-二酮。加热时,降冰片烯-二烯基稠合的二氢尿嘧啶16通过环戊二烯的分解产生2,4-嘧啶二酮。化合物的结构由1 H和13证明C nmr光谱。