Phosphine-Catalyzed Enantioselective γ-Addition of 3-Substituted Oxindoles to 2,3-Butadienoates and 2-Butynoates: Use of Prochiral Nucleophiles
作者:Tianli Wang、Weijun Yao、Fangrui Zhong、Guo Hao Pang、Yixin Lu
DOI:10.1002/anie.201307757
日期:2014.3.10
first phosphine‐catalyzed enantioselective γ‐addition with prochiral nucleophiles and 2,3‐butadienoates as the reaction partners has been developed. Both 3‐alkyl‐ and 3‐aryl‐substitutedoxindoles could be employed in this process, which is catalyzed by a chiral phosphine that is derived from an amino acid, thus affording oxindoles that bear an all‐carbon quaternary center at the 3‐position in high yields
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 [3 + 2] Cycloaddition of Allenes to Acrylates Catalyzed by Dipeptide-Derived Phosphines: Facile Creation of Functionalized Cyclopentenes Containing Quaternary Stereogenic Centers
作者:Xiaoyu Han、Youqing Wang、Fangrui Zhong、Yixin Lu
DOI:10.1021/ja1106282
日期:2011.2.16
A new family of dipeptide-based chiral phosphines was designed and prepared. D-Thr-L-tert-Leu-derived catalyst 4c promoted [3 + 2] cycloaddition of allenoates to α-substituted acrylates in a regiospecific and stereoselective manner, furnishing functionalized cyclopentenes with quaternary stereogenic centers in high yields and with excellent enantioselectivities.
Synthetic and Computational Study of the Enantioselective [3+2]-Cycloaddition of Chromones with MBH Carbonates
作者:Ling Meng、Heyang Liu、Zhenyang Lin、Jun Wang
DOI:10.1021/acs.orglett.2c01922
日期:2022.8.19
Highly efficient and straightforward access to enantioenriched five-membered ring-fused chromanones is developed via [3+2]-cycloaddition of 3-cyanochromones with Morita–Baylis–Hillman carbonates. Densely functionalized chiral cyclopenta[b]chromanones with three continuous quaternary and tertiary stereogenic carbon centers were obtained in high yields with high ee and dr (≤97% yield, 97% ee, and >20:1
通过 3-氰基色酮与 Morita-Baylis-Hillman 碳酸盐的 [3+2]-环加成,开发了高效且直接地获得对映体富集的五元环稠合色酮。以高产率和高 ee 和 dr ( ≤97% 产率、97% ee 和 >20:1 dr)获得了具有三个连续四元和叔立体碳中心的密集官能化手性环戊二烯色酮。此外,已经进行了密度泛函理论计算以研究反应的机理以及区域和非对映选择性。
Phosphine-Catalyzed Asymmetric [4+2] Annulation of Vinyl Ketones with Oxindole-Derived α,β-Unsaturated Imines: Enantioselective Syntheses of 2′,3′-Dihydro-1′<i>H</i>-spiro[indoline-3,4′-pyridin]-2-ones
作者:Xiao-Nan Zhang、Gen-Qiang Chen、Xiang Dong、Yin Wei、Min Shi
DOI:10.1002/adsc.201300828
日期:2013.11.25
AbstractA novel asymmetric [4+2] annulation of vinyl ketones with oxindole‐derived α,β‐unsaturated imines has been developed in the presence of a multifunctional thiourea‐phosphine catalyst derived from a natural amino acid, providing the first phosphine‐catalyzed enantioselective synthesis of 2′,3′‐dihydro‐1′H‐spiro[indoline‐3,4′‐pyridin]‐2‐ones in good yields with excellent stereoselectivities under mild conditions.magnified image