作者:Angus W.J. Logan、Jeremy S. Parker、Michal S. Hallside、Jonathan W. Burton
DOI:10.1021/ol300625u
日期:2012.6.15
Manganese(III) acetatemediated oxidative radicalcyclizations have been used to synthesize a range of densely functionalized and sterically congested cyclopentane-lactones. A number of the resulting lactones contain vicinal all-carbon quaternary stereocenters adjacent to a tertiary benzylic stereocenter and are formed with high levels of stereocontrol.
We have developed a nickel-catalyzedcross-coupling reaction of cyclic alkenyl ethers with arylboronic esters that leads to the formation of unsaturated alcohols via ring-opening by the cleavage of a C(sp2)–O bond. The use of 1,3-dicyclohexylimidazol-2-ylidene as the ligand is essential to promote this cross-coupling process.
Asymmetric 5-endo chloroetherification of homoallylic alcohols toward the synthesis of chiral β-chlorotetrahydrofurans
作者:Xianghua Zeng、Chengxia Miao、Shoufeng Wang、Chungu Xia、Wei Sun
DOI:10.1039/c2cc38436a
日期:——
An asymmetric 5-endo chloroetherification of homoallylic alcohols is successfully developed that employs an easily available quaternary ammonium salt derived from cinchonine as a conventional organocatalyst. This approach provides ready access to beta-chlorotetrahydrofurans in high enantioselectivities.
Ligand‐Dictated Regiodivergent Allylic Functionalizations via Palladium‐Catalyzed Remote Substitution
作者:Xin Wang、Han-Zhe Miao、Guo-Qiang Lin、Zhi-Tao He
DOI:10.1002/anie.202301556
日期:——
Palladium-catalyzed regiodivergent allylic C−H functionalizations were established via remote substitution, which provides a novel model for the seldomly studied migratory Tsuji–Trost reaction. 1,4-Hydrofunctionalization of a conjugated diene intermediate was demonstrated to be feasible via a newly synthesized bisphosphine ligand.