Synthesis of Chiral Benzofuran-Derived β-Amino Esters Induced by N-tert-Butanesulfinamide
摘要:
The benzofuran skeleton is commonly found in a wide variety of natural products that display a wide range of biological activities. For this reason, benzofuran has a high potential for use as a scaffold in both chemical and pharmaceutical syntheses of natural products. This work describes the development of a novel asymmetric synthetic method of benzofuran-derived -amino esters via K2CO3-promoted domino reactions of ortho-hydroxyl aromatic N-tert-butylsulfinyl imines and diethyl bromomalonate. A small library of target compounds was prepared under optimized reaction conditions in moderate to good yields with high distereoselective and enantioselective properties. The newly generated chiral carbon center was of an (S)-configuration as determined by x-ray diffraction.
Cycloaddition of Chiral <i>tert</i>-Butanesulfinimines with Trimethylenemethane
作者:George Procopiou、William Lewis、Gareth Harbottle、Robert A. Stockman
DOI:10.1021/ol400720b
日期:2013.4.19
The cycloaddition of chiral tert-butanesulfinimines with trimethylenemethane is found to give facile access to methylene-pyrrolidines with good yields and diastereoselectivities. The full scope of the cycloaddition is explored, and a range of transformations of the formed methylenepyrrolidines to give a range of functionalized chiral pyrrolidines is presented.