Homocoupling of aldimines mediated by zirconocene: synthesis of vicinal diamines and imidazolidines
摘要:
The reductive coupling of imines in the presence of the lanthanide-originated zirconocene equivalent allows the synthesis of vicinal diamines or imidazolidines under mild conditions in good yields with high diastereoselectivity. (C) 2011 Elsevier Ltd. All rights reserved.
Homocoupling of aldimines mediated by zirconocene: synthesis of vicinal diamines and imidazolidines
摘要:
The reductive coupling of imines in the presence of the lanthanide-originated zirconocene equivalent allows the synthesis of vicinal diamines or imidazolidines under mild conditions in good yields with high diastereoselectivity. (C) 2011 Elsevier Ltd. All rights reserved.
Stereoselective pinacol coupling of planar chiral (benzaldehyde)Cr(CO)3, (benzaldimine)Cr(CO)3, ferrocenecarboxaldehyde and (dienal)Fe(CO)3 complexes with samarium diiodide
作者:Nobukazu Taniguchi、Motokazu Uemura
DOI:10.1016/s0040-4020(98)00778-9
日期:1998.10
intermolecular pinacol coupling of the planar chiral tricarbonylchromium complexes of o-substituted benzaldehydes or benzaldimines with samarium(II) diiodide in THF produces exclusively threo 1,2-diols or 1,2-diamines in an optically pure form, while the corresponding racemico-substituted benzaldehyde or benzaldimine chromium complexes give a mixture of threo and erythro pinacol coupling products in a various
CHEMICAL TRANSFER OF WARNING INFORMATION IN NON-INJURED FISH
作者:Luciana Jordão、Gilson Volpato
DOI:10.1163/156853900502286
日期:——
Moreover, we investigate whether this chemicalinformation indicates the presence of a specific predator, or whether it indicates general disturbance. We exposed groups of pacus to the view of a predator fish (trahira, Hoplias malabaricus ), a non-predator fish (piracanjuba, Brycon orbignyanus ) or an aquarium without any fish (control), and then we transferred their water to isolated conspecifics.
We report the first direct and chemoselective reductive homocoupling reaction of secondary amides and cross-coupling reaction of secondary amides with ketones. This method relies on the direct generation of α-amino carbon radicals from amides.
Synthesis of Enantiomerically Pure 1,2-Diamines by Reductive Coupling of Tricarbony(benzaldimine)chromium Complexes
作者:Nobukazu Taniguchi、Motokazu Uemura
DOI:10.1055/s-1997-721
日期:——
Enantiomerically pure 1,2-diamines are prepared by intermolecular pinacol coupling of planar chiral (benzaldimine)Cr(CO)3 complexes with samarium(II) diiodide.
α-Amino acid synthesis via a Cu(II) chiral Lewis acid mediated addition of soft carbon nucleophiles to glycine cation equivalents
作者:Rick Attrill、Heather Tye、Liam R Cox
DOI:10.1016/j.tetasy.2004.04.018
日期:2004.6
A new method for the formation of alpha-amino, acid derivatives via Lewis acid mediated additions of soft carbon nucleophiles to carbamate protected glycine cation equivalents is described. A number of derivatives have been prepared in moderate yields and up to 85% ee using a Cu(II)-diamine catalyst combination. (C) 2004 Elsevier Ltd. All rights reserved.