lewis acid stereocontrolled additions of a silyl ketene acetal to 2 3 login, make payment, customer service number online

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Lewis acid stereocontrolled additions of a silyl ketene …

https://www.sciencedirect.com/science/article/pii/S0040403900016749

Nov 25, 2000

 · Lewis acid stereocontrolled additions of a silyl ketene acetal to 2,3-di-O-isopropylidene-d-glyceraldehyde nitrones. Synthesis of l -isoxazolidinyl nucleosides Author links open overlay panel Pedro Merino Eva M del Alamo Maite Bona Santiago Franco Francisco L Merchan Tomas Tejero Odile Vieceli

Lewis Acid Stereocontrolled Addition of a Silyl Ketene …

https://www.researchgate.net/publication/224045916…

ChemInform Abstract: Lewis Acid Stereocontrolled Addition of a Silyl Ketene Acetal to 2,3-Di-O-isopropylidene-D-glyceraldehyde Nitrones. Synthesis of L-Isoxazolidinyl Nucleosides

ChemInform Abstract: Lewis Acid Stereocontrolled Addition …

https://www.deepdyve.com/lp/wiley/cheminform…

Feb 20, 2001

 · Lewis Acid Stereocontrolled Addition of a Silyl Ketene Acetal to 2,3‐Di‐O‐isopropylidene‐D‐glyceraldehyde Nitrones. Synthesis of …

Silyl Ketene Acetals/B(C₆F₅)₃ Lewis Pair-Catalyzed Living …

https://pubmed.ncbi.nlm.nih.gov/29543743

This work reveals the silyl ketene acetal (SKA)/B(C₆F₅)₃ Lewis pair-catalyzed room-temperature group transfer polymerization (GTP) of polar acrylic monomers, including methyl linear methacrylate (MMA), and the biorenewable cyclic monomers γ-methyl-α-methylene-γ-butyrolactone (MMBL) and α-methylene-γ …

Stereocontrolled 1,3-addition reaction of silyl ketene …

https://www.sciencedirect.com/science/article/pii/S0040402000009819

Jan 01, 2001

 · To a solution of nitrone 7 (1 equiv.) in dichloromethane (5 mL) was added Lewis acid (0.1, 1.2 or 3.0 equiv.) at 0°C and the reaction mixture was stirred for 30 min. After cooling (−78°C or −10°C) silyl ketene acetal 6 (1.3 equiv.) in solvent (5 mL) was added and stirred for required time at specific temperature .

Lewis Base Activation of Lewis Acids. Addition of Silyl …

https://pubs.acs.org/doi/abs/10.1021/ja0282947

Oct 19, 2002

 · The weak Lewis acid silicon tetrachloride can be activated by catalytic amounts of the chiral bisphosphoramide (R,R)-3 to form a highly reactive, chiral trichlorosilyl cation which is an extremely effective promoter of aldol addition reactions between aldehydes and silyl ketene acetals. The tert-butyldimethylsilyl ketene acetal of methyl acetate adds nearly …

Facial selectivity in the addition of ketene acetals to …

quod.lib.umich.edu/a/ark/5550190.0002.b02?rgn=main;view=fulltext

Sep 26, 2001

 · We had reported that reactions with nitrone 2 in the absence of Lewis acids led to syn adducts in the case of nucleophilic addition processes,13 and, on the other hand, anti compounds were obtained in 1,3-dipolar cycloadditions.2e At this point we think that this tendency could be applicable to the stereocontrolled addition of silyl ketene acetals to 2 and that two …

Harnessing the ambiphilicity of silyl nitronates in a …

https://www.nature.com/articles/s41929-021-00714-x

Dec 02, 2021

 · Now, silylium-based Lewis acids are used for their activation, achieving the catalytic asymmetric nucleophilic addition of silyl ketene acetals to silyl nitronates for the synthesis of β3-amino …

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