Faster, higher, stronger! The N‐heterocyclic carbene (NHC) catalyzed diastereo‐ and enantioselectivehydroacylation of cyclopropenes affords structurally valuable acylcyclopropanes. A new family of electron‐rich, 2,6‐dimethoxyphenyl‐substituted NHCs induces excellent reactivity and enantioselectivity. Preliminary kinetic studies unambiguously demonstrated the superiority of this family of catalysts
Carbene‐Catalyzed Enantioselective Hydrophosphination of α‐Bromoenals to Prepare Phosphine‐Containing Chiral Molecules
作者:Rakesh Maiti、Jia‐Lei Yan、Xing Yang、Bivas Mondal、Jun Xu、Huifang Chai、Zhichao Jin、Yonggui Robin Chi
DOI:10.1002/anie.202112860
日期:2021.12.13
AbstractDisclosed herein is the first carbene‐organocatalyzed asymmetric addition of phosphine nucleophiles to the in situ generated α,β‐unsaturated acyl azolium intermediates. Our reaction enantioselectively constructs carbon–phosphine bonds and prepares chiral phosphines with high optical purities. The phosphine products are suitable for transforming to chiral ligands or catalysts with applications in asymmetric catalysis. The diarylalkyl or trialkyl phosphine products from our catalytic reactions, air‐sensitive and reactive in nature, can be trapped (and stored) in their sulfur‐oxidized form for operational simplicities.