Diastereoselective Synthesis of Useful Building Blocks by Crotylation of β-Branched α-Methylaldehydes with Potassium Crotyltrifluoroborates
作者:Kyosuke Tanaka、Yukiko Fujimori、Yoko Saikawa、Masaya Nakata
DOI:10.1021/jo801106b
日期:2008.8.1
was realized by the substrate-controlled crotylation of β-branched α-methylaldehydes with potassium crotyltrifluoroborates. Especially, crotylation of 2-(1,3-dithian-2-yl)propanal with potassium (E)-crotyltrifluoroborate afforded, in good yield and with excellent diastereoselectivity, a useful building block that has different and potential functional groups on both ends.
具有连续的甲基,羟基和甲基取代基的立体三单元组的非对映选择性结构是通过β-支化的α-甲基醛与巴豆基三氟硼酸钾的底物控制的丁酰化实现的。尤其是,用(E)-巴豆基三氟硼酸钾对2-(1,3-二苯-2-基)丙醛进行丁酰化,以高收率和优异的非对映选择性提供了有用的结构单元,该结构单元的两端具有不同的和潜在的官能团。