Trans-cyclization products were selectively formed from C-6-substituted acetoxy-octadienes only via Ni(0) catalysis ( → ) and from C-4-substituted analogs under Pd(0)- Ni(0) catalysis (, → ). C-5-Substituted precursors gave mixtures of diastereoisomers. Nickel(0) catalyzed allylation/methoxycarbonylation of iodo diene afforded 2-oxa-bicyclo[3.3.0]octanone with highly diastereoselective generation of
反式-cyclization产物选择性地从C-6取代的乙酰氧基
辛二烯只形成通过的Ni(0)催化(→ )和选自Pd下C-4取代的类似物(O) -的Ni(0)催化(,→ )。用C-5-5取代的前体得到非对映异构体的混合物。
镍(0)催化的
碘代二烯的烯丙基化/甲氧羰基化提供了2-氧杂-双环[3.3.0]辛酮,具有三个非立体异构中心的高度非对映选择性。