2-氰基-4'-甲基联苯的合成研究
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摘要
2-氰基-4’-甲基联苯是制备沙坦类抗高血压药物的关键中间体。研究了以对氯甲苯和镁为原料,碘的引发下合成对甲苯基氯化镁中间体,再进一步与邻氯苯腈反应合成目标化合物的反应特性。
     在对甲苯基氯化镁合成反应中,考察了反应中所用的原料、溶剂等因素,并用单因素法探索其优化反应条件。研究了不同溶剂对对甲苯基氯化镁产率的影响,在四氢呋喃与甲苯混合溶剂中,对甲苯基氯化镁产率为77.7%。在无水无氧条件下,以过渡金属(MnCl_2、CoCl_2、NiCl_2、CuCl_2、Ni(PPh_3)_2Cl_2、CdCl_2)为催化剂,以THF、甲苯或THF、甲苯混合溶剂为溶剂,对甲苯基氯化镁为反应中间体与邻氯苯腈偶联制得目标化合物。实验发现,MnCl(25 mol%)催化,THF溶剂中目标产物的产率为87.2%;混合溶剂中产率降为79.3%,减少了副产物的种类,提高了反应的选择性。讨论金属化合物催化剂作用下的合成反应特性和机理,提高产品选择性和收率并建立合适的纯化方法,使反应具有可实际操作性。对目标产物进行了~1HNMR、IR的结构表征。
2-cyano-4’-methylbiphenyl, which is a key intermediate used for the preparation of antihypertensive drugs, was synthesized by the couple of p-methyl phenylmagnesium chloride with o-chlorobenzonitrile.
     In the reaction of p-metheylphenylmagnesium chloride, several factors including the species of materials, solvent were discussed through single-factor approach and the optimum reaction condition was obtained. GC yield of 77.7% p-tolylmagnesiumchloride intermediate in toluene-tetrahydrofuran mixed solvents was obtained based on internal standard analysis.
     2-cyano-4’-methylbiphenyl was easily synthesized by the coupling of non-active o-chlorobenzonitrile with p-methylphenylmagnesium chloride in toluene-tetrahydrofuran mixed solvents over transition-metal catalysts(MnCl_2、CoCl_2、NiCl_2、CuCl_2、Ni(PPh_3)_2Cl_2、CdCl_2). Various reaction conditions, especially catalysis of some catalysts were discussed to improve selectivity suitable for industrialization in the recycle solvent system. The structures of target products-biphenyl compounds were characterized through 1HNMR and IR. In the coupling reaction, various reaction conditions, especially catalysis of some metal catalysts, were discussed to improve product yield and purity to meet commercial use.
引文
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