Regioselective alkylation of 2-alkyl-5,6,7,8-tetrahydro-3H-cycloheptimidazol-4-one (1) and 2-alkyl-3H-cycloheptimidazol-4-one (2) was investigated. 3-[2′-(1-tert-Butyl-1H-tetrazol-5-yl)biphenyl-4-ylmethyl]-2-propyl-5,6,7,8-tetrahydro-1H-cycloheptimidazol-4-one (6) was preferentially obtained under the conditions by using NaH in DMF or THF. On the other hand, 3-[2′-(1-tert-butyl-1H-tetrazol-5-yl)biphenyl-4-ylmethyl]-2-propyl-5,6,7,8-tetrahydro-3H-cycloheptimidazol-4-one (5), the synthetic intermediate compound of Pratosartan, was obtained selectively in the presence of n-Bu4NBr in toluene by using aqueous sodium hydroxide as a base. In this reaction, it was found that the concentration of the alkaline solution influences its regioselectivity. This selectivity was observed even for aldehyde and ester derivatives.
研究了2-烷基-5,6,7,8-四氢-3H-环庚
咪唑-4-酮(1)和2-烷基-3H-环庚
咪唑-4-酮(2)的区域选择性烷基化反应。在
DMF或THF中使用NaH的条件下,优先得到3-[2′-(1-叔丁基-
1H-四唑-5-基)
联苯-4-基甲基]-2-丙基-5,6,7,8-四氢-1H-环庚
咪唑-4-酮(6)。另一方面,在
甲苯中使用
水合
氢氧化钠作为碱和n-Bu4NBr存在下,选择性得到3-[2′-(1-叔丁基-
1H-四唑-5-基)
联苯-4-基甲基]-2-丙基-5,6,7,8-四氢-3H-环庚
咪唑-4-酮(5),即普拉托沙坦的合成中间体化合物。在这项反应中,发现碱性溶液的浓度影响其区域选择性。这种选择性甚至在醛和酯衍
生物中也观察到。