Catalyzed hydrogenation of condensed three-ring arenes and their N-heteroaromatic analogues by a bis(dihydrogen) ruthenium complex
作者:Andrzej F. Borowski、Laure Vendier、Sylviane Sabo-Etienne、Ewa Rozycka-Sokolowska、Alicja V. Gaudyn
DOI:10.1039/c2dt31205k
日期:——
A series of anthracene and acridine derivatives were hydrogenated under mild reaction conditions (80 °C, 3 bar of H2) using the bis(dihydrogen) complex [RuH2(η2-H2)2P(C6H11)3}2] (1) as a catalyst precursor. The influence of a methyl substituent on the substrate was studied. In all our systems, hydrogenation was only observed at the external rings leading to the corresponding 4H- or 8H-derivatives of anthracene and acridine. Three complexes resulting from the η4(C,C)-coordination of the substrate to the unsaturated fragment [RuH2P(C6H11)3}2] were characterized. In the case of 9-methyl acridine, the corresponding complex [RuH2(η4-C14H11N)P(C6H11)3}2] (4) turned out to be an active catalyst precursor leading to 1,2,3,4,5,6,7,8-octahydro-9-methylacridine as the sole product after 24 h. Regeneration of 1 from 4 supports the role of complex 4 in the catalytic cycle. Three hydrogenated products, 1,2,3,4-tetrahydroanthracene (4H-Anth), 1,2,3,4-tetrahydro-9-methylanthracene (4H-9-Me-Anth) and 1,2,3,4-tetrahydroacridine (4H-Acr), were characterized by X-ray diffraction.
一系列蒽和喹啉衍生物在温和的反应条件下(80 °C,3 bar H2)使用双(二氢)配合物[RuH2(η2-H2)2P(C6H11)3}2] (1)作为催化剂前体进行了氢化反应。研究了甲基取代基对底物的影响。在我们所有的体系中,氢化仅在外环上观察到,导致相应的4H-或8H-蒽和喹啉衍生物。三个由于底物与不饱和片段[RuH2P(C6H11)3}2]的η4(C,C)配位而生成的配合物被表征。在9-甲基喹啉的情况下,相应的配合物[RuH2(η4-C14H11N)P(C6H11)3}2] (4)被证明是一个活跃的催化剂前体,经过24小时反应后,仅生成1,2,3,4,5,6,7,8-八氢-9-甲基喹啉。1从4的再生支持了配合物4在催化循环中的角色。通过X射线衍射表征了三个氢化产物:1,2,3,4-四氢蒽(4H-Anth)、1,2,3,4-四氢-9-甲基蒽(4H-9-Me-Anth)和1,2,3,4-四氢喹啉(4H-Acr)。