Retro-ene reactions in heterocyclic synthesis.<b>IV</b>. A new synthetic method for 6-hydroxypyrimidin-4(3<i>H</i>)-ones and 1,3,5-triazine-2,4(1<i>H</i>,3<i>H</i>)-diones
作者:Kunio Ito、Shingo Miyajima
DOI:10.1002/jhet.5570360107
日期:1999.1
N-t-Butylbenzamidines 1 reacted with diphenyl phenylmalonate or diphenyl methylmalonate to give 6-hydroxypyrimidin-4(3H)-ones 4 or 5. Amidines 1 on reaction with diphenyl imidodicarboxylate afforded 1,3,5-triazine-2,4(1H, 3H)-diones 8.
N-吨-Butylbenzamidines 1与碳酸二苯苯基丙二或二苯基甲基丙反应,得到6-羟基嘧啶-4-(3 H ^) -酮4或5脒1上,得到与碳酸二苯imidodicarboxylate反应-1,3,5-三嗪-2,4( 1 H,3 H)-二酮8。
Retro-ene reactions in heterocyclic synthesis. v. a novel synthetic method for 1,3,5-triazine-2,4(1H,3H)-diones
作者:The Late Kunio Ito、Chiharu Sekiguchi、Asuka Wakai Hiroyuki Miida、Shogo Ihara
DOI:10.1002/jhet.5570440648
日期:2007.11
N-t-Butylamidines 1 on heating with diphenyl carbonate (2) at 150-180° gave the 1,3,5-triazine-2,4(1H,3H)-dione derivatives 5. Acylation of amidines 1 and cyclocondensation of the resulting carbamates 3 gave [1,3,5,7]tetrazocine-2,6-dione derivatives 4, and subsequent retro-enereaction and ring contraction afforded triazine derivatives 5.