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Building C(sp3) Molecular Complexity on 2,2′‐Bipyridine and 1,10‐Phenanthroline in Rhenium Tricarbonyl Complexes
Chemistry - A European Journal ( IF 3.9 ) Pub Date : 2020-10-01 , DOI: 10.1002/chem.202003814
Julio Pérez 1 , Rebeca Arevalo 2 , Ramón López 3 , Larry Falvello 4 , Lucía Riera 5
Affiliation  

The reactions of [Re(N‐N)(CO)3(PMe3)]OTf (N‐N=2,2′‐bipyridine, bipy; 1,10‐phenanthroline, phen) compounds with tBuLi and with LiHBEt3 have been explored. Addition to the N‐N chelate took place with different site‐selectivity depending on both chelate and nucleophile. Thus, with tBuLi, an unprecedented addition to C5 of bipy, a regiochemistry not accessible for free bipy, was obtained, whereas coordinated phen underwent tBuLi addition to C2 and C4. Remarkably, when LiHBEt3 reacted with [Re(bipy)(CO)3(PMe3)]OTf, hydride addition to the 4 and 6 positions of bipy triggered an intermolecular cyclodimerization of two dearomatized pyridyl rings. In contrast, hydride addition to the phen analog resulted in partial reduction of one pyridine ring. The resulting neutral ReI products showed a varied reactivity with HOTf and with MeOTf to yield cationic complexes. These strategies rendered access to ReI complexes containing bipy‐ and phen‐derived chelates with several C(sp3) centers.

中文翻译:

在三羰基hen络合物中的2,2'-联吡啶和1,10-菲咯啉上构建C(sp3)分子复杂性

[Re(N-N)(CO)3(PMe 3)] OTf(N-N = 2,2'-联吡啶,bipy; 1,10-菲咯啉,phen)化合物与t BuLi和LiHBEt 3的反应已被探索。根据螯合物和亲核试剂的不同,添加N-N螯合物的位点选择性也不同。因此,通过t BuLi,获得了比联吡啶C5前所未有的添加,这是游离联吡啶无法获得的区域化学,而对联苯酚进行了t BuLi加入C2和C4。值得注意的是,当LiHBEt 3与[Re(bipy)(CO)3(PMe 3)] OTf,在bipy的4和6位上加成氢化物会触发两个脱芳基吡啶基环的分子间环二聚。相反,将氢化物加到phen类似物上导致一个吡啶环的部分还原。所得的中性Re I产物显示出与HOTf和与MeOTf的变化的反应性,以产生阳离子络合物。这些策略使人们可以访问含有由Bipy和phen衍生的螯合物以及多个C(sp 3)中心的Re I复合物。
更新日期:2020-10-01
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