Using the Curtius reaction, the acids VIa and VIv were transformed to the carbamates IVa and IVb which afforded by alkaline hydrolysis the primary amines Ia and Ib. The N-methyl derivatives IIab were obtained by reduction of the carbamates IVa with lithium aluminium hydride. The N,N-dimethyl derivatives IIIab resulted by methylation of the primary amines Iab with formaldehyde and formic acid. The synthesis of the acid VIb was carried out from phthalide and 2-methoxythiophenol in seven steps. The amines Iab-IIIab showed clear thymoleptic properties in the test of reserpine ptosis in mice and by inhibition of the perphenazine catalepsy in rats. The acid VIb has antiinflammatory activity.
使用Curtius反应,酸VIa和VIv转化为尿素酯IVa和IVb,通过碱性水解得到主要胺Ia和Ib。N-甲基衍生物IIab通过还原尿素酯IVa得到。N,N-二甲基衍生物IIIab通过用甲醛和甲酸对主要胺Iab进行甲基化得到。酸VIb的合成是从邻苯二甲酸酐和2-甲氧基噻吩在七个步骤中完成的。胺Iab-IIIab在小鼠对利血平致眼睑下垂试验中表现出明显的抗抑郁特性,并通过抑制对氯丙嗪对大鼠的猫状痉挛来展现。酸VIb具有抗炎活性。