Visible-Light-Driven, Metal-Free Divergent Difunctionalization of Alkenes Using Alkyl Formates
作者:Ming Zheng、Jing Hou、Le-Wu Zhan、Yan Huang、Ling Chen、Li-Li Hua、Yan Li、Wan-Ying Tang、Bin-Dong Li
DOI:10.1021/acscatal.0c04332
日期:2021.1.15
difunctionalization of alkenes has received considerable attention as an efficient and straightforward way to increase molecular complexity. However, examples of the difunctionalization of alkenes initiated by the intermolecular addition of alkoxycarbonyl radicals providing substituted alkanoates are still rare. Herein, we present the visible light-driven metal-free divergent difunctionalization of alkenes triggered
Enantioselective synthesis of anti- and syn-β-hydroxy-α-phenyl carboxylates via boron-mediated asymmetric aldol reaction
作者:P. Veeraraghavan Ramachandran、Prem B. Chanda
DOI:10.1039/c3cc40860d
日期:——
enantioselective synthesis of anti- and syn-beta-hydroxy-alpha-phenyl carboxylates has been achieved by the proper choice of solvent, temperature, alkoxy group, and amine for the diisopinocampheylboron-mediated asymmetric enolization-aldolization of phenylacetates. The pure diastereomers can be readily separated by column chromatography.
Bismuth trichloride as a new efficient catalyst in the aldol reaction
作者:Hidenori Ohki、Makoto Wada、Kin-ya Akiba
DOI:10.1016/s0040-4039(00)80590-0
日期:——
In the presence of a catalytic amount of bismuthtrichloride (5 mol%), silyl enol ethers react with aldehydes at room temperature to give the corresponding aldols in good yields.
Conversion of isoxazolines to β-hydroxy esters. Synthesis of 2-deoxy-D-ribose
作者:P. Caldirola、M. Ciancaglione、M. De Amici、C. De Micheli
DOI:10.1016/s0040-4039(00)85028-5
日期:——
A simple and effficient preparation of β-hydroxy esters with a well-defined stereochemistry has been developed using 3-bromoisoxazolines as key-intermidiates. A synthesis of 2-decxy-D-ribose is also reported
A facile and convenientsynthesis of trisubstituted (E)-α,β-unsaturated esters was developed by improving our previously established method. The new method circumvented the separation of the intermediates, which have an activating group of the hydroxyl group in β-hydroxy esters, furnishing α,β-unsaturated esters in shorter steps than the previous method: an acetylation of β-hydroxy group and subsequent