A rigid dirhodium(II) carboxylate as an efficient catalyst for the asymmetric cyclopropanation of olefins
作者:Sophie K Bertilsson、Pher G Andersson
DOI:10.1016/s0022-328x(00)00025-5
日期:2000.5
The dirhodium(II) complex 7 of (1S,3R,4R)-2-(p-tert-butylphenylsulphonyl)-2-aza-bicyclo[2.2.1]heptane-3-carboxylic acid (3) (or its enantiomer) was synthesised in four steps from cyclopentadiene, (R)- or (S)-phenylethylamine and methyl glyoxylate. Complex 7 was evaluated as a catalyst in the asymmetric cyclopropanation of alkenes with vinyl- and phenyl-diazoesters, resulting in enantioselectivity of
(1 S,3 R,4 R)-2-(对-叔丁基丁基苯磺酰基)-2-氮杂-双环[2.2.1]庚烷-3-羧酸(3)的二价铑(II)配合物7(3)(或它的对映体)是由环戊二烯,(R)-或(S)-苯乙胺和乙醛酸甲酯分四个步骤合成的。在烯烃与乙烯基和苯基重氮酯的不对称环丙烷化反应中,络合物7被评估为催化剂,对映选择性高达92%。