Chemistry of novel compounds with multifunctional carbon structure. 7. Synthetic studies of the potentially versatile monofluoro molecules, .alpha.-functionalized .alpha.-fluoro-.beta.-keto esters
Asymmetric Mannich-type Reactions of Fluorinated Ketoesters with Binaphthyl-Modified Thiourea Catalysts
作者:Young-Ku Kang、Sung-Je Yoon、Dae-Young Kim
DOI:10.5012/bkcs.2011.32.4.1195
日期:2011.4.20
enantioselective Mannich-type reaction promoted by chiral binaphthyl-modified bifunctionalorganocatalysts is described. The treatment of α-fluoro-β-ketoesters with N-Boc imines under mild reactionconditions afforded the corresponding β-aminated α-fluoro-β-ketoesters with excellent enantioselectivities (upto 98% ee).Key Words : Mannichreaction, Asymmetric catalysis, Bifunctional organocatalyst, α-Fluoro-β-ketoesters
Highly Enantioselective Amination Reactions of Fluorinated Keto Esters Catalyzed by Novel Chiral Guanidines Derived from Cinchona Alkaloids
作者:Xiao Han、Fangrui Zhong、Yixin Lu
DOI:10.1002/adsc.201000562
日期:2010.11.2
NovelCinchona alkaloid-derived guanidinescatalyze stereoselective aminations of fluorinatedketoesters, affording products with fluorine-containing quaternary stereogenic centers in excellent yields and with moderate to high enantioselectivities.
Primary-secondary diamines catalyzed Michael reaction to generate chiral fluorinated quaternary carbon centers
作者:Yingpeng Lu、Gang Zou、Gang Zhao
DOI:10.1016/j.tet.2015.04.103
日期:2015.6
Asymmetric Michaelreactions of α-fluoro-β-ketoesters to nitroolefins have been achieved by using readily accessible primary-secondary diamines as the organocatalysts through enamine activation mode, affording the useful Michael adducts bearing chiral fluorinated quaternary carbon in good yields, with high diastereoselectivities and enantioselectivities (up to 87% yield, >20:1 d.r. and 99% ee).
Asymmetric Mannich Reaction of Fluorinated Ketoesters with a Tryptophan-Derived Bifunctional Thiourea Catalyst
作者:Xiao Han、Jacek Kwiatkowski、Feng Xue、Kuo-Wei Huang、Yixin Lu
DOI:10.1002/anie.200903635
日期:2009.9.28
Fluorinated quaternary stereocenters: A novel bifunctionalcatalyst 1 derived from natural tryptophan promoted the Mannichreaction of α‐fluoro‐β‐ketoesters to afford fluorinated chiral molecules containing vicinal quaternary and tertiary stereogenic centers with exceptional enantioselectivity. An unprecedented α‐fluoro‐β‐lactam was also prepared by this method (see scheme; Boc=tert‐butoxycarbonyl)
Catalytic asymmetric Mannich-type reactions of fluorinated ketoesters with N-Boc aldimines in the presence of chiral palladium complexes
作者:Young Ku Kang、Dae Young Kim
DOI:10.1016/j.tetlet.2011.02.087
日期:2011.5
The catalytic enantioselective Mannich reaction promoted by chiral palladium complexes is described. The treatment of alpha-fluoro-beta-ketoesters with N-Boc-aldimines under mild reaction conditions afforded the corresponding beta-aminated alpha-fluoro-beta-ketoesters with excellent enantioselectivities (up to 99% ee). (C) 2011 Elsevier Ltd. All rights reserved.