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Enantioselective Hydroboration of Ketones Catalyzed by Rare-Earth-Metal Complexes Supported with Phenoxy-Functionalized TsDPEN Ligands
Organometallics ( IF 2.5 ) Pub Date : 2021-07-09 , DOI: 10.1021/acs.organomet.1c00272 Qishun Yu 1 , Chengrong Lu 1 , Bei Zhao 1
Organometallics ( IF 2.5 ) Pub Date : 2021-07-09 , DOI: 10.1021/acs.organomet.1c00272 Qishun Yu 1 , Chengrong Lu 1 , Bei Zhao 1
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Six novel chiral rare-earth-metal complexes bearing the phenoxy-functionalized TsDPEN ligand H3L1 (H3L1 = N-((1R,2R)-2-((3,5-di-tert-butyl-2-hydroxybenzyl)amino)-1,2-diphenylethyl)-4-methylbenzenesulfonamide) were synthesized successfully and well characterized. The solid-state structures of four tetranuclear rare-earth-metal complexes [RE2L13]2 (RE = Nd (1), Sm (2), Eu (3), Gd (4)) and the dual-core yttrium complex Y2L13 (5) were determined by X-ray diffraction, respectively. The structure of lanthanum complex 6 was speculated by the 1H DOSY spectroscopy in THF-d8 together with DFT calculations. Complexes 1–5 were employed to catalyze the enantioselective hydroboration of ketones and α,β-unsaturated ketones using pinacolborane (HBpin) as a reductant, and complex 1 gave better outcomes in comparison to the others. The corresponding secondary alcohols were obtained in excellent yields and moderate ee values. The same results were also achieved using the combined catalyst system of the neodymium amide Nd[N(SiMe3)2]3 with the phenoxy-functionalized TsDPEN ligand H3L1 in a 1:1.5 molar ratio.
中文翻译：
苯氧基官能化 TsDPEN 配体负载的稀土金属配合物催化酮的对映选择性硼氢化反应
六新型手性稀土类金属络合物轴承苯氧基官能化TsDPEN配位体H 3大号1（H 3大号1 = ñ - （（1 - [R，2 - [R）-2 - （（3,5-二-叔丁基-2-羟基苄基）氨基）-1,2-二苯基乙基）-4-甲基苯磺酰胺）已成功合成并得到很好的表征。四种四核稀土金属配合物[RE 2 L 1 3 ] 2 (RE = Nd ( 1 ), Sm ( 2 ), Eu ( 3 ), Gd ( 4 ))和双核的固态结构钇配合物 Y 2L 1 3 ( 5 ) 分别由X-射线衍射测定。镧配合物6的结构由THF- d 8中的1 H DOSY光谱以及DFT计算推测。配合物1 - 5被用于催化使用频哪醇（HBpin）作为还原剂酮和α，β不饱和酮的对映选择性硼氢化，和复杂1相比于其他人给出了更好的结果。以极好的收率和适中的ee值获得了相应的仲醇。使用钕酰胺 Nd[N(SiMe3 ) 2 ] 3与苯氧基官能化的TsDPEN配体H 3 L 1 的摩尔比为1:1.5。
更新日期：2021-08-09
中文翻译：
苯氧基官能化 TsDPEN 配体负载的稀土金属配合物催化酮的对映选择性硼氢化反应
六新型手性稀土类金属络合物轴承苯氧基官能化TsDPEN配位体H 3大号1（H 3大号1 = ñ - （（1 - [R，2 - [R）-2 - （（3,5-二-叔丁基-2-羟基苄基）氨基）-1,2-二苯基乙基）-4-甲基苯磺酰胺）已成功合成并得到很好的表征。四种四核稀土金属配合物[RE 2 L 1 3 ] 2 (RE = Nd ( 1 ), Sm ( 2 ), Eu ( 3 ), Gd ( 4 ))和双核的固态结构钇配合物 Y 2L 1 3 ( 5 ) 分别由X-射线衍射测定。镧配合物6的结构由THF- d 8中的1 H DOSY光谱以及DFT计算推测。配合物1 - 5被用于催化使用频哪醇（HBpin）作为还原剂酮和α，β不饱和酮的对映选择性硼氢化，和复杂1相比于其他人给出了更好的结果。以极好的收率和适中的ee值获得了相应的仲醇。使用钕酰胺 Nd[N(SiMe3 ) 2 ] 3与苯氧基官能化的TsDPEN配体H 3 L 1 的摩尔比为1:1.5。
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