3'-N}(eta(4)-tetraphenylcyclobutadiene)cobalt]dipalladium (COP-X), containing bridging groups X=OAc, Cl, Br, I, O(2)CCF(3), p-O(2)CC(6)H(4)F, were synthesised and compared as catalysts for the asymmetric allylic imidate rearrangement of (E)-Cl(3)CC(=NH)OCH(2)CH=CHR with R=nPr. The enantiomeric excess of the product (S)-Cl(3)CC(=O)NHCHRCH=CH(2) was essentially invariant of X (93-96%) and the yield increased
二聚palladacycles,二-mu-X-双[eta(5)-(S)-((p)R)-2- [2'-(4'-
甲基乙基)
恶唑啉基]
环戊二烯基,1-C,3' -N}(eta(4)-四
苯基
环丁二烯)
钴]二
钯(
COP-X),包含桥接基团X =
OAc,Cl,Br,I,O(2)CCF(3),pO(2)CC(6)合成H(4)F,并将其作为(E)-Cl(3)CC(= NH)OCH(2)CH = CHR(R = nPr)的不对称
烯丙基亚
氨酸
酯重排的
催化剂进行比较。(S)-Cl(3)CC(= O)NHCHRCH = CH(2)的对映体过量基本上是X不变的(93-96%),产率在序列I中增加