Organocatalytic Asymmetric Fluorination/Semipinacol Rearrangement: An Efficient Approach to Chiral β-Fluoroketones
作者:Zhi-Min Chen、Bin-Miao Yang、Zhi-Hua Chen、Qing-Wei Zhang、Min Wang、Yong-Qiang Tu
DOI:10.1002/chem.201202444
日期:2012.10.8
An asymmetricfluorination/semipinacol rearrangement of 2‐oxa allylic alcohols, as catalyzed by cinchona‐alkaloid derivatives, gives chiral β‐fluoro ketones with moderate to high levels of enantioselectivity (see scheme). Both enantiomers of the product could be obtained by using the appropriate catalyst.
A novel copper‐catalyzed tandem trifluoromethylation/semipinacol rearrangement reaction of allylic alcohols has been achieved under mild conditions. This reaction is valuable for the difunctionalization of alkenes through simultaneous construction of a CCF3 bond and a quaternary carbon center, and could provide a straightforward strategy for the preparation of α‐quaternary β‐trifluoromethyl ketone
A Tin(IV) Chloride Promoted Tandem C–O Bond Cleavage/Nazarov Cyclization/Nucleophilic Addition Reaction of 1,1-Disubstituted Allylic Ethers toward the Synthesis of Multisubstituted Indenes
作者:Chao Yang、Zheng-Liang Xu、Hui Shao、Xue-Qing Mou、Jie Wang、Shao-Hua Wang
DOI:10.1021/acs.orglett.5b02610
日期:2015.11.6
A novel SnCl4-promoted tandem reaction toward multisubstituted indenes via a sequential C–O bond cleavage/Nazarovcyclization/nucleophilic addition reaction has been developed to afford a series of multisubstituted indenes with an all-carbon quaternary center in moderate to good yields.