New C2-symmetric tetrafluorobenzobarreleneligands were prepared and applied successfully to the rhodium-catalyzedasymmetric addition of arylboronic acids to aromatic aldehydes giving chiral diarylmethanols in high yield with high enantioselectivity.
AlCl<sub>3</sub>and BDMAEE: A Pair of Potent Reactive Regulators of Aryl Grignard Reagents and Highly Catalytic Asymmetric Arylation of Aldehydes
作者:Xin-Yuan Fan、Yong-Xin Yang、Fang-Fang Zhuo、Sheng-Li Yu、Xiao Li、Qi-Peng Guo、Zhi-Xue Du、Chao-Shan Da
DOI:10.1002/chem.201000974
日期:2010.7.19
Cheap, energy‐saving, and applicable: With the aid of AlCl3 and BDMAEE [2,2′‐oxybis(N,N‐dimethylethanamine)], a highly asymmetriccatalytic addition of various aryl Grignard reagents to aldehydes was achieved under mild conditions with easily prepared (S)‐H8‐BINOL and inexpensive commercially available Ti(OiPr)4 (see scheme), and the reaction could be easily scaled up with no loss of yield and enantioselectivity
廉价,节能且适用:借助AlCl 3和BDMAEE [2,2'-氧双(N,N-二甲基乙胺)],在温和条件下,将各种芳基格氏试剂高度不对称催化加成到醛中用易于制备的(S)-H 8 -BINOL和便宜的市售Ti(O i Pr)4(参见方案),该反应可以轻松扩大规模,而不会损失收率和对映选择性。