A new chiral HBD system, N-tert-butyl sulfinyl squaramide, was designed and synthesized. The core N-tert-butyl sulfinyl squaramide with an 1-aminoindan-2-ol skeleton was found to be an efficient catalyst in the enantioselectiveFriedel–Craftsalkylation of indoles and acyl phosphonates.
N‐Heterocyclic Carbene‐Catalyzed
<i>β</i>
‐Indolylation of
<i>α</i>
‐Bromoenals with Indoles
作者:Shaofa Sun、Ming Lang、Jian Wang
DOI:10.1002/adsc.201900699
日期:2019.12.17
An unprecedented example of NHC‐catalyzedβ‐indolylation of α‐bromoenals with indoles has been developed. This concise protocol features several advantages (mild reaction conditions, broad substrate scope) and constructs synthetically useful building blocks, namely β‐biaryl methylene esters. Notably, the β‐biaryl methylene‐type fragment is widely found in natural products or pharmaceuticals.
Catalytic Enantioselective Friedel-Crafts Alkylation of Indoles with β,γ-Unsaturated α-Keto Phosphonates in the Presence of Chiral Palladium Complexes
作者:Dae Kim、Young Kang、Ki Suh
DOI:10.1055/s-0030-1259932
日期:2011.5
The catalytic enantioselective Friedel―Crafts alkylation reaction promoted by chiralpalladium complexes is described. The treatment of indoles with β,γ-unsaturated α-ketophosphonates under the mild reaction conditions afforded the corresponding Friedel―Crafts alkylation adducts with excellent enantioselectivities (up to 99% ee).