我们报道了金鸡纳生物碱催化苯硫酚加成快速相互转化的芳基萘醌,在还原甲基化后产生稳定的联芳基阻转异构体。对一系列苯硫酚和萘醌底物进行了评估,我们观察到高达 98.5:1.5 的选择性。对醌氧化还原性质的控制使我们能够研究底物每种氧化态的立体化学稳定性。所得的对映体富集产物还可以通过 S N Ar 类反应序列继续进行,以获得具有优异对映体保留的稳定衍生物。
Catalytic, Diastereoselective 1,2-Difluorination of Alkenes
作者:Steven M. Banik、Jonathan William Medley、Eric N. Jacobsen
DOI:10.1021/jacs.6b02391
日期:2016.4.20
with all types of substitution patterns. In general, the vicinal difluoride products are produced with high diastereoselectivities. The observed sense of stereoinduction implicates anchimericassistance pathways in reactions of alkenes bearing neighboring Lewis basic functionality.
The hydroboration of olefins with Et(2)BH provides diethyl(alkyl)boranes 2 which readily undergo a boron-zincexchange with Et(2)Zn providing a range of polyfunctional primary, secondary, and benzylic diorganozincs. The resulting diorganozincs 3 have been reacted with various electrophiles (allylic halides, acid chlorides, alkylidenemalonates, ethyl propiolate, nitroolefins) in the presence of CuCN
A cobaltporphyrin‐catalyzed chlorotrifluoromethylation reaction of olefins is described. The use of CF3SO2Cl as the CF3 radical source and a cobaltcatalyst enabled the selective addition of CF3 radicals under thermal conditions.
描述了钴卟啉催化的烯烃的氯三氟甲基化反应。CF 3 SO 2 Cl作为CF 3自由基源和钴催化剂的使用使得能够在热条件下选择性地添加CF 3自由基。
Catalytic Enantioselective Alkylative Dearomatization−Annulation: Total Synthesis and Absolute Configuration Assignment of Hyperibone K
作者:Ji Qi、Aaron B. Beeler、Qiang Zhang、John A. Porco, Jr.
DOI:10.1021/ja1057828
日期:2010.10.6
The asymmetric total synthesis of the polyprenylated acylphloroglucinol hyperibone K has been achieved using an enantioselective alkylative dearomatization-annulation process. NMR and computational studies were employed to probe the mode of action of a chiral phase-transfer (ion pair) catalyst.