کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5266732 1385318 2012 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A practical asymmetric conjugate addition to cyclic enones with chiral bifunctional Ru amido catalysts
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
A practical asymmetric conjugate addition to cyclic enones with chiral bifunctional Ru amido catalysts
چکیده انگلیسی
A practical asymmetric C-C bond formation to synthetically useful β-chiral cyclic ketones (>99% ee) using bifunctional chiral amido Ru catalysts under an S/C = 1000, the highest ratio achieved so far in the literature for this class of reactions, is described. The catalytic reactivity decreases in the order of Ru(Msdpen)(hmb) > Ru(Pfbsdpen)(hmb) > Ru(Tsdpen)(hmb) > Ru(PMsdpen)(hmb), where Ru(Pfbsdpen)(hmb) is a newly developed chiral bifunctional catalyst. Complex Ru(Msdpen)(hmb) was identified as the best in terms of reactivity and enantioface selectivity, whereas Ru(PMsdpen)(hmb) gave unsatisfactory results. An importance of the NH proton in the bifunctional catalyst for determining the enantioselectivity has been experimentally demonstrated. Valuable information for the reaction mechanism was accumulated.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Tetrahedron Letters - Volume 53, Issue 27, 4 July 2012, Pages 3452-3455
نویسندگان
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