Synthesis of syn-3a(12c),9a(9b)-dihomoperylene-3,10-dione, (E )-syn-2,2′-bi(7H-1,6-methano[10]annulenylidene)-7,7′-dione and of its rearrangement product, trans-12a,12b-dihydro-3a(12c),9a(9b)-dihomoperylene-3,10-dione
作者:Aderson de Farias Dias、Thomas Helwig、Johann Lex、Joseph Miller、Hans Schmickler
DOI:10.1039/b001786h
日期:——
using a Ni(0) complex, to give isomeric mixtures of rac- and meso-7,7-dimethoxy- and -diethoxy-2,2′-bi(1,6-methano[10]annulenyl)s (IIIA and IIIB). Oxidative coupling of a mixture of compounds IIIA and IIIB with thallium(III) trifluoroacetate in acetonitrile gave (E)-syn-2,2′-bi(7H-1,6-methano[10]annulenylidene)-7,7′-dione IV as the main reaction product, accompanied by a small amount of syn-3a(12c)
本工作的主要目的是评估1,6-甲基[10]环戊烯衍生物的合成 苝 和 ylene 3,10-二酮。合成序列的起始材料是2,7-二溴-1,6-甲基[10]环戊烯(I),其通过甲氧基-和乙氧基-脱溴S N Ar-型反应被转化为2-溴-7-甲氧基-和-7-乙氧基-1,6-甲基[10]环戊烯(II)。该反应比表面上相似的卤代萘的反应容易得多。使用Ni(0)络合物将化合物II还原偶联,得到rac-和meso -7,7-二甲氧基-和-dithoxy-2,2'-bi(1,6-methano [10] annulenyl )的异构体混合物)(IIIA和IIIB)。化合物IIIA和IIIB的混合物与铊(III)三氟乙酸盐 在 乙腈得到(ë) -顺式-2,2'-双(7- ħ -1,6-亚甲基[10] annulenylidene)-7,7'二酮IV作为主要反应产物,并伴有少量顺式-3a (12c),9a(9b