An Improved Convergent Synthesis of AZD7762: A One-Pot Construction of a Highly Substituted Thiophene at the Multikilogram Scale
作者:Matthew Ball、Martin F. Jones、Fiona Kenley、J. David Pittam
DOI:10.1021/acs.oprd.6b00364
日期:2017.3.17
A multikilogram synthesis of AZD7762 has been achieved using a highly convergent route employing two efficient telescoped sequences to generate the key intermediates. Aminothiophene 11 is formed in a four-step, one-pot addition–elimination–cyclization sequence from cinnamonitrile 9, constructing the trisubstituted thiophene ring with the desired API substitution pattern in place. Cinnamonitrile 9 is
AZD7762的多公斤级合成已使用高度收敛的路线实现,该路线采用两个有效的伸缩序列生成关键中间体。氨基噻吩11由肉桂腈9以四步,一锅加成-消除-环化顺序形成,从而构建了具有所需API取代模式的三取代噻吩环。肉桂腈9是通过3-氟苯乙酮的精制而得到的。从手性哌啶5分离的5个阶段中,尿素官能团的生成以及随后的脱保护作用,以49%的收率提供AZD7762与第一代方法相比,收率提高了5倍,从而减少了原料负担并消除了以前对金属介导的偶联和色谱法的要求。