Synthesis and Fungicidal Activity of Novel 4,4‘-Bis(2‘ ‘-aryl-5‘ ‘-methyl/unsubstituted-4‘ ‘-oxo-thiazolidin-3‘ ‘-yl) Bibenzyl
作者:Ibadur R. Siddiqui、Pravin K. Singh、Jaya Singh、Jagdamba Singh
DOI:10.1021/jf0342324
日期:2003.11.1
Reduction followed by nitration of benzil I yielded 4,4'-dinitrobibenzyl (III) which by reduction furnished quantitatively and analytically pure 4,4'-diaminobibenzyl (IV) which on condensation with different carbonyl compounds gave 4,4'-bis (benzylideneamino) bibenzyls (Va-f). Compounds (Va-f) on cycloaddition with mercaptoacetic acid/2-mercaptopropionic acid yielded the corresponding 4-oxothiazolidin-3-yl
还原,然后硝化苯甲I,得到4,4'-二硝基联苄基(III),通过还原提供定量和分析纯的4,4'-二氨基联苄基(IV),与不同的羰基化合物缩合后得到4,4'-双(苄叉基氨基) )联苄基(Va-f)。与巯基乙酸/ 2-巯基丙酸环加成的化合物(Va-f)产生相应的4-氧噻唑烷-3-基联苄基(VIa-1)。化合物VIg-1在每个噻唑烷酮部分中具有两个手性中心,因此可能存在两个非对映异构体,但是通过结晶和重复色谱法,获得了一个非对映异构体。非对映异构体的绝对构型是根据(1)1 H NMR谱图暂时确定的。(1)产物的1 H NMR谱图显示噻唑烷酮环的C(5)-CH(3)在δ1.22处具有明显的二重峰(22,23)和C(5)-H质子在4.20处的一个不同的四重奏。同样,C(2)质子在δ5.95处显示出独立的单峰,因此将获得的非对映异构体分配为反式构型。体外评价了化合物Va-f和VIa-1对尖孢镰刀菌和柠