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作者:Michał Malik , Piotr Cmoch , Mykhaylo A. Potopnyk ...
来源:[J].Tetrahedron: Asymmetry(IF 2.115), 2017, Vol.28 (12), pp.1750-1755Elsevier
摘要:Abstract(#br)A novel reaction cascade involving a Lewis acid-induced migration of an isopropylidene protecting group followed by the formation of a pyranose or furanose ring and subsequent reduction of the hemiacetal is described. Depending on the reaction conditions, as well as,...
作者:Konstantin N. Gavrilov , Sergey V. Zheglov , Ilya V. Chuchelkin ...
来源:[J].Tetrahedron: Asymmetry(IF 2.115), 2017, Vol.28 (11), pp.1633-1643Elsevier
摘要:Abstract(#br)A practical synthesis of new phosphoramidite, phosphite and diamidophosphite P , N -ligands derived from ( R , R )-tartaric acid was carried out. A study of these chiral inducers showed them to provide up to 93% ee in the Pd-catalyzed asymmetric allylations of (...
来源:[J].Tetrahedron: Asymmetry(IF 2.115), 2017, Vol.28 (1), pp.A1-A61Elsevier
作者:Shunsuke Kotani , Takuya Hanamure , Hirono Nozaki ...
来源:[J].Tetrahedron: Asymmetry(IF 2.115), 2017, Vol.28 (2), pp.282-287Elsevier
摘要:Abstract(#br)The enantioselective chlorinative aldol reaction of α-substituted acroleins with aldehydes catalyzed by chiral phosphine oxides is described. A hypervalent silicon complex-derived chloride adds to the α-substituted acroleins to form the corresponding silyl enol ...
作者:Declan P. Gavin , Aoife Foley , Thomas S. Moody ...
来源:[J].Tetrahedron: Asymmetry(IF 2.115), 2017, Vol.28 (4), pp.577-585Elsevier
摘要:Abstract(#br)Hydrolase-catalysed dynamic kinetic resolutions of chroman-2-ol and 3-methyl chroman-2-ol can be effected with up to 88% conversion and 92% ee through the use of organic solvents. Extension to the resolution of the tolterodine precursor 1 proved more challenging. The...
来源:[J].Tetrahedron: Asymmetry(IF 2.115), 2017, Vol.28 (4), pp.VI-VIIElsevier
作者:In-Soo Myeong , Yong-Taek Lee , Sang-Hyun Lee ...
来源:[J].Tetrahedron: Asymmetry(IF 2.115), 2017, Vol.28 (8), pp.1053-1060Elsevier
摘要:Abstract(#br)Stereoselective allylation reactions of acyclic and chiral α-amino-β-hydroxy aldehydes affording chiral β-amino-α,γ-diols are described. Several Lewis acids (BF 3 ·OEt 2 , SnCl 4 , TiCl 4 , ZnCl 2 , and MgBr 2 ·OEt 2 ) were employed to mediate the allylatio...
来源:[J].Tetrahedron: Asymmetry(IF 2.115), 2017, Vol.28 (1), pp.I-VElsevier
作者:Eleuterio Burgueño-Tapia , Katia Chávez-Castellanos , Ernestina Cedillo-Portugal ...
来源:[J].Tetrahedron: Asymmetry(IF 2.115), 2017, Vol.28 (1), pp.166-174Elsevier
摘要:Abstract(#br)The absolute configuration of jatropholone A 1 and B 2 , including the possibility to observe the vibrational circular dichroism (VCD) capacity to differentiate between two epimeric compounds in the presence of an inherently dissymmetric chromophore, which normally d...
作者:Matthew W.D. Perry , Anders Eriksson , Marie Rydén Landergren
来源:[J].Tetrahedron: Asymmetry(IF 2.115), 2017Elsevier
摘要:Abstract(#br)We observed a discrepancy between the reported specific rotation for the enantiomers of 1-cyclopropylethan-1-amine and the values for commercial material. Analyses by VCD of the free amine, by NMR analysis of the derived ( S )-O-methylmandelamides and an X-ray crysta...

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