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作者:Raju Nandhakumar , Yong-En Guo , Hyunjung Park ...
来源:[J].Tetrahedron Letters(IF 2.397), 2007, Vol.48 (37), pp.6582-6585
摘要:Abstract(#br)A novel auxillary chiral ketone has been designed, synthesized, and used to enantioselectively recognize 1,2-amino alcohols. This work proves that the keto group can serve as a chiral recognition center by imine formation supported by resonance assisted hydrogen bond...
作者:Patricia Bataille , Michel Paterne , Eric Brown
来源:[J].Tetrahedron: Asymmetry(IF 2.115), 2000, Vol.11 (5), pp.1165-1181
摘要:Abstract(#br)Various chiral N , N -dialkylhydrazines were prepared in four to five steps from ( R )-(–)-2-aminobutan-1-ol 6 . They reacted with various prochiral ketones, thus giving the corresponding hydrazones. Reduction of the latter by means of LiAlH 4 afforded N , N ...
作者:L. L. Troitskaya , T. V. Demeshchik , S. T. Ovseenko ...
来源:[J].Russian Chemical Bulletin(IF 0.423), 2003, Vol.52 (3), pp.616-623
摘要:Abstract(#br)The formation of a new chiral center in the reactions of ketone 4-MeOC 6 H 4 CH(Et)C(O)Et with planar-chiral 2-lithio-1-methyl- and 1-chloro-2-lithioferrocenes proceeded stereoselectively to give two diastereomers in a ratio of ∼3 : 2 or a single diastereomer, re...
作者:Huang Haofei , Nandhakumar Raju , Choi Misun ...
来源:[J].Journal of the American Chemical Society, 2013, Vol.135 (7), pp.2653-8
摘要:The chiral ketone (S)-3 shows high kinetic enantioselectivities toward the L form for general underivatized amino acids with hydrophobic side chains and a high thermodynamic enantioselectivity toward the D form for cysteine with its -SH polar side chain when used as an extractant...
作者:H.-Q. Ge
来源:[J].Synlett(IF 2.655), 2004, Vol.2004 (11), pp.2046-2047
作者:Joaquim Nebot , Sergi Figueras , Pedro Romea ...
来源:[J].Tetrahedron(IF 2.803), 2006, Vol.62 (48), pp.11090-11099
摘要:Abstract(#br)Titanium-mediated aldol reactions based on ( S )-2- tert -butyldimethylsilyloxy-3-pentanone, a lactate-derived chiral ketone, provide the corresponding 2,4- syn -4,5- syn adducts in high yields and diastereomeric ratios with a wide array of achiral and chiral aldehyd...
作者:Tian Hongqi , She Xuegong , Yu Hongwu ...
来源:[J].The Journal of organic chemistry(IF 4.564), 2002, Vol.67 (8), pp.2435-46
摘要:This paper describes a new class of chiral oxazolidinone ketone catalyst for asymmetric epoxidation. High ee values have been obtained for a number of cyclic and acyclic cis-olefins. The epoxidation was stereospecific with no isomerization observed in the epoxidation of acyclic s...
作者:Yasushi Kawai , Motoko Hayashi , Norihiro Tokitoh
来源:[J].Tetrahedron(IF 2.803), 2005, Vol.61 (21), pp.5049-5055
摘要:... Chiral hydrazones prepared from the hydrazine and various chiral ketones gave suitable single crystals for X-ray crystallographic analysis. The absolute configurations of the hydrazones were determined by X-ray crystallographic analysis using anomalous dispersion effect of th...
作者:José M. Vega-Pérez , Margarita Vega-Holm , Ignacio Periñán ...
来源:[J].Tetrahedron(IF 2.803), 2010, Vol.67 (2), pp.364-372
摘要:Abstract(#br)A range of new, somewhat complex, stereochemically varied, and structurally related carbohydrate-derived ketones were synthesised by a simple method from the carbohydrate precursor ( d - gluco and d - galacto derivatives). The common skeleton possesses the keto funct...

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