Quinazolin-2-ones having a spirohydantoin ring. I. Synthesis of spiro(1,2,3,4-tetrahydroquinazoline-4,4'-imidazolidine)-2,2',5'-trione by reaction of 1-carbamoylisatin with urea or guanidine.
作者:Masafumi YAMAGISHI、Ken-ichi OZAKI、Hiroshi OHMIZU、Yoshihisa YAMADA、Mamoru SUZUKI
DOI:10.1248/cpb.38.2926
日期:——
Reaction of 1-methylcarbamoylisation (4) with urea in the presence of 1, 8-diazabicyclo[5.4.0]undec-7-ene (DBU) gave 4-hydroxy-3-methyl-4-ureidocarbonyl-1, 2, 3, 4-tetrahydroquinazolin-2-one (5), which was easily cyclized with 10% HCl to afford a spirohydantoin derivative; 3-methyl-spiro[1, 2, 3, 4-tetrahydroquinazoline-4, 4'-imidazolidine]-2, 2', 5'-trione (6). In a similar manner, 2'-imino-3-methyl-spiro[1, 2, 3, 4-tetrahydroquinazoline-4.4'-imidazolidine]-2, 5'-dione (8) was prepared by the reaction of 4 with guanidine, and 8 was further converted to the spirohydantoin compound 6 by treatment with sodium nitrite in acetic acid.
在 1, 8-二氮杂双环[5.4.0]十一-7-烯(DBU)存在下,1-甲基氨基甲酰化(4)与尿素反应,得到 4-羟基-3-甲基-4-脲羰基-1, 2, 3, 4-四氢喹唑啉-2-酮(5)。0]十一碳-7-烯(DBU)的条件下与脲反应,得到 4-羟基-3-甲基-4-脲羰基-1,2,3,4-四氢喹唑啉-2-酮(5),用 10% HCl 很容易将其环化,得到螺海因衍生物;3-甲基-螺[1,2,3,4-四氢喹唑啉-4,4'-咪唑烷]-2,2',5'-三酮(6)。用类似的方法,通过 4 与胍的反应制备了 2'-亚氨基-3-甲基-螺[1,2,3,4-四氢喹唑啉-4.4'-咪唑烷]-2,5'-二酮(8),通过在乙酸中使用亚硝酸钠处理,8 进一步转化为螺海因化合物 6。