| 摘要 |
Novel, chiral diarsine compounds, which are present in the (R)- or (S)- or (rac)-form, of the general formula (see fig. I) wherein R signifies an optionally substituted aryl from the group of phenyl, naphthyl, furyl and thienyl; C3-8-cycloalkyl or C1-8-alkyl; R1, R2, R3 each independently signify C1-8-alkyl, C1-8-alkoxy, aryloxy, F or Cl, R2 and R3 each independently also signify hydrogen or R1 and R2 together signify tetramethylene or a benzo or benzofuro system on the respective benzene ring; and the manufacture of the diarsine compounds of formula I, as well as complexes of the compounds of formula I with Group VIII metal and their use for enantioselective reactions. Among other things they are usable in the synthe sis of benzopyranyl potassium channel openers (compounds of formula V wherein D is N-oxide). |
