complexes, cationic (R)-BINAP–Pd2+(SbF6-)2 and neutral (R)-DABNTf–Pd(CH3CN)2 were examined as chiral catalysts for enantioselective Claisen rearrangement. DABNTf–Pd(CH3CN)2 complex gave high enantio- and anti-diastereoselectivity, and good yield. This Claisen rearrangement should proceed via six-membered boat transition state through bi-dentate coordination to the Pd catalyst.
研究了两种类型的
钯配合物,阳离子(R)-BINAP-Pd2 +(SbF6-)2和中性(R)-
DABNTf-Pd(CH 3 CN)2作为对映选择性克莱森重排的手性催化剂。
DABNTf-Pd(CH 3 CN)2络合物具有高对映和反非对映选择性,并具有良好的收率。这种克莱森重排应通过六元小船过渡状态,通过双齿配位到Pd催化剂进行。