Siloxyallenes revisited. A useful functional intermediate for the synthesis of (Z)-β-branched Morita–Baylis–Hillman type adducts and (Z)-chalcones
作者:Kazuhiro Yoshizawa、Takayuki Shioiri
DOI:10.1016/j.tet.2007.02.025
日期:2007.7
Siloxyallenes proved to be a usefulfunctionalintermediate in the preparation of (Z)-β-branched Morita–Baylis–Hillman type adducts by the reaction of aldehydes with silylacetylenes or siloxypropynes. Various (Z)-chalcones were stereoselectively synthesized from siloxypropynes via siloxyallenes.
lene in the presence of a catalytic amount of the Brønstedacido-benzenedisulfonimide under mild conditions to give good yields of the corresponding products. The catalyst can be easily recovered and purified for use in further reactions, which has economic and ecological advantages. homogeneous catalysis - Brønstedacid - Hosomi-Sakurai reaction - acetals - alcohols
An Alternative Approach to Direct Aldol Reaction Based on Gold-Catalyzed Methoxyl Transfer
作者:Moran Zhang、Yunxia Wang、Yang Yang、Xiangdong Hu
DOI:10.1002/adsc.201100789
日期:2012.4.16
A mild and catalyzed alternative to the direct aldol reaction has been developed based on the gold‐catalyzed methoxy group transfer from dimethyl acetals to terminal alkynes. Due to the simultaneous activation of the acetals, this aldol approach is only functional for acetals but not aldehydes. A ligand effect from the gold complex has also been observed.
Heterogeneous gold(I)-catalyzed three-component reaction of aldehydes, alkynes, and orthoformates toward propargyl ethers
作者:Jiajun Zeng、Feiyan Yi、Mingzhong Cai
DOI:10.1080/00397911.2020.1761391
日期:2020.7.2
Abstract A novel and efficient heterogeneous gold(I)-catalyzed three-component reaction of aldehydes, alkynes, and orthoformates has been developed that proceeds smoothly in dichloroethane (DCE) at 83 °C in the presence of 5 mol% magnetic nanoparticles-anchored phosphine gold(I) complex (Fe3O4@SiO2-P-AuOTf) and offers a general and practical approach for the preparation of a variety of propargyl ethers