Asymmetric cyclizations via a sequential Michael addition/Conia-ene reaction by combining multifunctional quaternary phosphonium salt and silver catalysis
A one-potasymmetricMichael addition/Conia-ene reaction sequence, catalyzed by combination of a dipeptide-derived multifunctional quaternary phosphonium salt and Ag2CO3 has been developed, which provides a series of synthetically important chiral methylenecyclopentane derivatives in moderate to excellent yields (up to 97%) and enantioselectivities (up to 93%).
已开发出一种由二肽衍生的多功能季phospho盐和Ag 2 CO 3组合催化的一锅不对称迈克尔加成反应/二氧化烯-烯反应序列,它以中等至极好的收率提供了一系列合成上重要的手性亚甲基环戊烷衍生物(高达97%)和对映选择性(高达93%)。
Access to CF3-benzofulvenes via palladium-catalyzed cascade arylation/Trost–Oppolzer cyclization/double-bond isomerization
Herein, we demonstrated a Pd-catalyzed cascade reaction that involves arylation, Trost–Oppolzer type Alder ene reaction, and double bond isomerization using the 4-(2-alkynylphenyl)-allylcarbonates and aryl boronic acids. This cascade process delivers a wide array of distinctive functionalized CF3-benzofulvenes in good yields with high stereoselectivity (E). A single palladium catalyst orchestrates