We have developed an efficient method for the preparation of enol silyl ethers using novel agents, silazanes together with NaH or DBU catalyst, wherein TMS and TBDMS groups were smoothly and chemoselectively introduced into ketones and aldehydes under mild conditions.
Bis‐Ketol Nucleoside Triesters as Prodrugs of the Antiviral Nucleoside Triphosphate Analogues of 3′‐Deoxythymidine and 3′‐Deoxy‐2′,3′‐didehydrothymidine
作者:Kim C. Calvo、Xiaohong Wang、Gerald F. Koser
DOI:10.1081/ncn-120030723
日期:2004.12.31
Derivatives of 3'-deoxythymidine (ddT) and 3'-deoxy-2',3'-didehydrothymidine (d4T) were prepared in which the 5'-hydroxyl group of the nucleoside was esterified to a bis-ketol phosphate. The resulting phosphate triesters are postulated to be prodrugs of the corresponding 5'-mononucleotides, which are formed intracellularly by the hydrolysis of the two ketol ester groups. The triesters were tested for
α-alkylation and α-alkylidenation of carbonyl compounds by o-silylated enolate phenylthioalkylation
作者:Ian Paterson
DOI:10.1016/s0040-4020(01)86667-9
日期:1988.1
For many reactions next to a carbonyl group, the use of O-silylated enolatechemistry offers improvements in yield and selectivity over the corresponding reactions of Group I metal enolates. In the case of α-alkylation of carbonylcompounds, Lewis-acid (TiCL4 or ZnBr2) promoted phenylthioalkylation of O-silylated enolates 3 by α-chlorosulphides 4 (R3=H, Me, Prn, Pri, But, and Me3Si), followed by reductive
Preparation of Silyl Enol Ethers Using (Bistrimethylsilyl)acetamide in Ionic Liquids
作者:Michael Smietana、Charles Mioskowski
DOI:10.1021/ol015602h
日期:2001.4.1
[reaction: see text]. Ionic liquids have been used for the preparation of silylenolethers from aldehydes and ketones with (bistrimethylsilyl)acetamide (BSA) in good yields.
Easy Preparation of Enoxysilanes from Aldehydes and Ketones Catalyzed by Samarium Diiodide
作者:Jérome Hydrio、Pierre Van de Weghe、Jacqueline Collin
DOI:10.1055/s-1997-1514
日期:1997.1
Ketones and α-substituted aldehydes are converted to trimethylsilyl enol ethers by reaction with the trimethylsilyl ketene acetal of methyl isobutyrate in dichloromethane in presence of a catalytic amount of samarium diiodide.