Iminophosphorane-mediated synthesis of fused uracils. A faclle one-pot preparation of pyrimido[4,5-d]pyrimidine derivatives
作者:Pedro Molina、Maria Jesús Vilaplana、Juana Pérez
DOI:10.1016/s0040-4020(01)90083-3
日期:1990.1
uracils, with aromatic isocyanates leads to the functionalized pyrimido[4,5-d]pyrimidines 4. Iminophosphoranes 5, prepared from 3 by selective reduction with sodium borohydride, undergo dihydropyrimido annelation by reaction with isocyanates to give 7-amino-6-aryl-1,3-dimethyl-1,2,3,4,5,6-hexahydropyrimido[4,5-d]pyrimidines 6.
亚氨基正膦的维蒂希氮杂型反应3 [( - ,5 Ñ -Arylimino)甲基] -6 - [(三苯基亚正膦基)氨基] -1,3-二甲基尿嘧啶,用芳香族异氰酸酯导致官能嘧啶并[4,5- d ]嘧啶4。亚氨基正膦5,从制备3通过用硼氢化钠选择性还原,通过与异氰酸酯反应进行二氢嘧啶并成环得到7-氨基-6-芳基- 1,3-二甲基-1,2,3,4,5,6-六氢嘧啶并[ 4,5- d ]嘧啶6。