1.3. 1 Stereoselective (Nucleophilic) Methylation of Ketones and Aldehydes
Buch
Herausgeber: van Leeuwen, P. W. N. M.
Titel: C-1 Building Blocks in Organic Synthesis 1
Untertitel: Additions to Alkenes, Alkynes, and Carbonyl Compounds
Print ISBN: 9783131707611; Online ISBN: 9783132064416; Buch-DOI: 10.1055/b-003-125818
1st edition © 2014. Thieme. All rights reserved.
Georg Thieme Verlag KG, Stuttgart
Fachgebiete: C1-bildende Blöcke in der organischen Synthese
Science of Synthesis Reference Libraries
Übergeordnete Publikation
Titel: Science of Synthesis
DOI: 10.1055/b-00000101
Typ: Mehrbändiges Werk
Abstract
Direct nucleophilic 1,2-methylations of aldehydes or ketones with polar methylmetal systems (e.g., methyllithium or Grignard reagents) are rarely (enantio)selective, due to fast background reactions. However, procedures with special chiral additives or even catalytic versions based on methylzinc or methyltitanium intermediates enable high and reliable selectivities with many substrates. Most modern are nickel and rhodium catalysts in cooperation with trimethylaluminum, providing catalytic and highly stereoselective methylations of aldehydes and ketones.
Schlüsselwörter
methylations - enantioselectivity - catalysis - aldehydes - ketones - methyllithium - methyl Grignard reagents - dimethylzinc - trimethylaluminum - methylnickel species - methylrhodium species - methylchromium species - methyltitanium species-
6 Ye M, Logaraj S, Jackman LM, Hillegass K, Hirsh KA, Bollinger AM, Grosz AL, Mani V. Tetrahedron 1994; 50: 6109
- 13 Soai K, Shibata T, Comprehensive Asymmetric Catalysis. Jacobsen EN, Pfaltz A, Yamamoto H. Springer; Heidelberg, Germany 1999. 2.
-
27 Takemoto Y, Baba Y, Honda A, Nakao S, Noguchi I, Iwata C, Tanaka T, Ibuka T. Tetrahedron 1998; 54: 15567
-
37 Rijnberg E, Hovestad NJ, Kleij AW, Jastrzebski JTBH, Boersma J, Janssen MD, Spek AL, van Koten G. Organometallics 1997; 16: 2847
-
50 Takemoto Y, Yoshikawa N, Baba Y, Iwata C, Tanaka T, Ibuka T, Ohishi H. J. Am. Chem. Soc. 1999; 121: 9143
-
54 Blay G, Fernández I, Hernández-Olmos V, Marco-Aleixandre A, Pedro JR. Tetrahedron: Asymmetry 2005; 16: 1953
-
68 Biswas K, Chapron A, Cooper T, Fraser PK, Novak A, Prieto O, Woodward S. Pure Appl. Chem. 2006; 78: 511