An efficient class of bis-NHC salts: applications in Pd-catalyzed reactions under mild reaction conditions
作者:Chien-Cheng Chiu、Hui-Tzu Chiu、Dong-Sheng Lee、Ta-Jung Lu
DOI:10.1039/c8ra04094j
日期:——
(bis-NHC) salts that can be easily made from commercially available and inexpensive starting materials. The application of these salts to Pd-catalyzed reactions is described. The palladium (Pd) catalyst generated in situ was highly effective undermild reaction conditions.
Pd(0)-Catalyzed Chemo-, Diastereo-, and Enantioselective α-Quaternary Alkylation of Branched Aldehydes
作者:Barry M. Trost、Zhijun Zuo、Youliang Wang、Johnathan E. Schultz
DOI:10.1021/acscatal.0c02861
日期:2020.8.21
from the established chiral α-quaternary aldehyde synthesis, this project employed a chiral π-allyl–Pd complex neighboring the enolate to determine both the enantio- and diastereoselectivity. The synthetic utility of the products has been highlighted by a series of derivatizations, and the potential of this method has been extended to the synthesis of chiral α-quaternary ketones. Furthermore, this
Organocatalytic Regiodivergent Ring Expansion of Cyclobutanones for the Enantioselective Synthesis of Azepino[1,2-<i>a</i>]indoles and Cyclohepta[<i>b</i>]indoles
作者:Wu-Lin Yang、Wen Li、Zhong-Tao Yang、Wei-Ping Deng
DOI:10.1021/acs.orglett.0c01406
日期:2020.5.15
series of azepino[1,2-a]indoles were obtained with exclusive regioselectivities and high diastereo- and enantioselectivities (up to >20:1 dr, 96% ee) with the application of the N1 nucleophilic site of the indole nucleus. Meanwhile, various cyclohepta[b]indoles could be accessed with high enantiopurity (up to 96% ee) through the Michael addition/boron-trifluoride-etherate-promoted indole C3-attack
Enantioselective Synthesis of Tropanes via [3+3] Annulation of Cyclic Azomethine Ylides with Substituted 2-Vinylindoles and 2-Vinylpyrroles
作者:Xing Zheng、Wu-Lin Yang、Yang-Zi Liu、Shu-Xiao Wu、Wei-Ping Deng
DOI:10.1002/adsc.201800553
日期:2018.8.6
via [3+3] annulation of cyclic azomethine ylides with substituted 2‐vinylindoles and 2‐vinylpyrroles in the presence of in‐house Cu(II)/N,O‐ligand complex has been developed. The reaction was achieved via a tandem copper(II)‐catalyzed Michael addition/BF3 ⋅ Et2O promoted intramolecular aza‐Friedel‐Crafts reaction of indoles or pyrroles with non‐activated ketimines, providing indole or pyrrole‐annulated