Catalytic Enantioselective Synthesis of Chiral Phthalides by SmI<sub>2</sub>-Mediated Reductive Cyclization of 2-Acylarylcarboxylates
作者:Ling-Lin Huang、Ming-Hua Xu、Guo-Qiang Lin
DOI:10.1021/ja061114z
日期:2006.5.1
A significant new and efficient catalytic asymmetric approach for the highly enantioselectivesynthesis of chiralphthalides by SmI2-induced reductivecyclization of 2-acylarylcarbonylates was developed. The combination of (4S,5R)-4,5-diphenyloxazolidin-2-one and 2,2,6,6-tetramethylpiperidine was found to be a very effective catalyst system in the reaction. This method provides a ready access to a
Preparation of Polyfunctional Organozinc Halides by an InX<sub>3</sub>- and LiCl-Catalyzed Zinc Insertion to Aryl and Heteroaryl Iodides and Bromides
作者:Andreas D. Benischke、Grégoire Le Corre、Paul Knochel
DOI:10.1002/chem.201605139
日期:2017.1.18
of zinc powder to various aryliodides in THF at 50 °C in up to 95 % yield. The use of a THF/DMPU (1:1) mixture shortens the reaction rates and allows the preparation of keto‐substituted arylzinc reagents. In the presence of In(acac)3 (3 mol %) and LiCl (150 mol %), the zinc insertion to various aryl and heteroaryl bromides proceeds smoothly (50 °C, 2–18 h). Alkyl bromides are also converted to the