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 alkylation of heteroaromatic compounds using alkylidene malonates
作者:Wei Zhuang、Tore Hansen、Karl Anker Jørgensen
DOI:10.1039/b009008p
日期:——
A catalytic enantioselective alkylation of heteroaromatic
compounds using alkylidene malonates has been developed; the reaction
proceeds for different heteroaromatic compounds with alkylidene malonates
in high yield and enantiomeric excess.
Asymmetric Friedel-CraftsReactions: Catalytic Enantioselective Addition of Aromatic and HeteroaromaticC-H Bonds to Activated Alkenes, Carbonyl Compounds, andImines
作者:Karl Anker Jørgensen
DOI:10.1055/s-2003-39176
日期:——
aromatic and heteroaromatic C-H bonds to α,β-unsaturated alkenes, carbonylcompounds, and imines are presented. α,β-Unsaturated alkenes, 4-substituted 2-oxo-3-butenoate esters and alkylidene malonates react with indoles, furans and electron-rich aromatic compounds in the presence of chiral bisoxazoline-copper(II) complexes to give the Friedel-Craftsalkylation adduct in moderate to high yields and with
介绍了催化对映选择性加成芳烃和杂芳烃 CH 键与 α,β-不饱和烯烃、羰基化合物和亚胺的发展和范围。α,β-不饱和烯烃、4-取代的 2-氧代-3-丁烯酸酯和亚烷基丙二酸酯与吲哚、呋喃和富电子芳香族化合物在手性双恶唑啉-铜 (II) 配合物存在下反应得到 Friedel-Crafts烷基化加合物,产率中等至高,ee 高达 >99.5%。手性双恶唑啉-铜(II)配合物还可以催化特别是富含电子的芳族化合物与活性羰基化合物如乙醛酸盐和三氟丙酮酸盐的对映选择性加成,从而以良好的收率和对映选择性得到例如光学活性芳族扁桃酸酯。