Asymmetric Morita-Baylis-Hillman Reaction: Catalyst Development and Mechanistic Insights Based on Mass Spectrometric Back-Reaction Screening
作者:Patrick G. Isenegger、Florian Bächle、Andreas Pfaltz
DOI:10.1002/chem.201604616
日期:2016.12.5
Morita–Baylis–Hillman (MBH) reaction was developed. By massspectrometric back‐reactionscreening of quasi‐enantiomeric MBH products, an efficient bifunctional phosphine catalyst was identified that outperforms literature‐known catalysts in the MBH reaction of methyl acrylate with aldehydes. The close match between the selectivities measured for the forward and back reaction and kinetic measurements provided
Enantioselective Synthesis of the Optically Active α-Methylene-β-hydroxy Esters, Equivalent Compounds to Morita−Baylis−Hillman Adducts, Using Successive Asymmetric Aldol Reaction and Oxidative Deselenization
作者:Isamu Shiina、Yu-suke Yamai、Takahisa Shimazaki
DOI:10.1021/jo051276y
日期:2005.9.1
The asymmetricaldol reaction of a tetra-substituted ketene silyl acetal including an alkylseleno group with aldehydes has been developed by the promotion of Sn(OTf)2 coordinated with a chiral diamine to afford the corresponding aldols having chiral quaternary centers at the α-positions. The facile oxidative deselenization of these aldol compounds produces optically active α-methylene-β-hydroxy esters
Enantioselective Morita–Baylis–Hillman reaction promoted by l-threonine-derived phosphine–thiourea catalysts
作者:Xiaoyu Han、Youqing Wang、Fangrui Zhong、Yixin Lu
DOI:10.1039/c1ob05881a
日期:——
A series of bifunctional phosphineâthiourea organic catalysts based on natural amino acid scaffolds were designed and prepared. L-Threonine-derived bifunctional phosphine catalysts were found to be very efficient in promoting asymmetric MoritaâBaylisâHillman (MBH) reaction of acrylates with aromatic aldehydes, affording the desired MBH adducts with up to 90% ee. To gain mechanistic insights into the reaction, the effects of adding various additives on the MBH reaction were investigated. We propose that the hydrogen bonding interactions between the thiourea moiety of the catalyst and the enolate intermediate are crucial for the stereochemical outcome of the reaction. The method described in this report may provide a practical solution to the enantioselective MBH reaction of simple acrylates.
<i>P</i>-Stereogenic β-Aminophosphines: Preparation and Applications in Enantioselective Organocatalysis
作者:Hsin Y. Su、Mark S. Taylor
DOI:10.1021/acs.joc.7b00199
日期:2017.3.17
configuration at phosphorus, is a key step in this process. The products obtained are new building blocks for the synthesis of P-chiral ligands and organocatalysts. In a proof-of-concept application in organocatalysis, the diastereomeric P-chiral β-aminophosphine-based bifunctional thioureas displayed significantly different activities in the Morita–Baylis–Hillman reaction of methyl acrylate with benzaldehyde