摘要:
The coupling reaction of 1-benzothiazolyl-2-aza-pentadienyl metals 3 with carbonyl compounds has been investigated. The reaction of 3 with aldehydes leads to alpha and/or gamma-regioisomeric homoallylic alcohols 8, 9 and 10 depending upon the experimental conditions. The coupling of 3 with alpha, beta-unsaturated carbonyl compounds was highly alpha-1, 4-regioselective. The reaction of 3b and 3e with chalcone afforded small amount of pyrrolidine 13, while the coupling of 3b and 3c with 2-cyclopentenone provided mainly pyrrolidines 18a and 18b respectively.