One-Pot Enol Silane Formation-Mukaiyama Aldol-Type Addition to Dimethyl Acetals Mediated by TMSOTf
作者:C. Wade Downey、Miles W. Johnson、Kathryn J. Tracy
DOI:10.1021/jo8001084
日期:2008.4.1
Various ketones, esters, amides, and thioesters add in high yield to dimethyl acetals in the presence of silyl trifluoromethanesulfonates and an amine base. Acetals derived from aryl, unsaturated, and aliphatic aldehydes are all effective substrates. The reaction proceeds in a single reaction flask, with no purification of the intermediate enolsilane necessary.
An Essentially Mild and Efficient Catalyst System for the Activation of Carbonyl Compounds and Their Derivatives. The Combined Use of Trimethylsilyl Chloride and Tin(II) Chloride
作者:Nobuharu Iwasawa、Teruaki Mukaiyama
DOI:10.1246/cl.1987.463
日期:1987.3.5
An essentially mild and efficient catalyst system, the combined use of trimethylsilyl chloride and tin(II) chloride, is effectively employed for the activation of acetals, aldehydes, orthoesters, and α,β-unsaturatedketones to accomplish the reaction with silyl enolethers to give the corresponding addition products in good yields.
Trimethylsilyl trifltate catalyzed aldol-type reaction of enol silyl ethers and acetals or related compounds
作者:Shizuaki Murata、Masaaki Suzuki、Ryoji Noyori
DOI:10.1016/s0040-4020(01)86671-0
日期:1988.1
condensation of enol trimethylsllyl ethers with acetals, orthoformate, or 2-acetoxytetrahydrofuran or -pyrans to give the corresponding β-alkoxy carbonylcompounds. Reaction of enolsilylethers and carboxonium triflate ion-pair intermediates occurs via acyclic transition states and exhibits moderate to high erythro selectivity independent of the geometry (E/Z) of the enolsilylethers.
and Michael reactions of silyl enol ethers with carbonyl compounds or other electrophiles (trimethyl orthoformate, dimethyl acetal, and chloromethyl methyl ether), the allylation reaction of allylsilanes with aldehydes, and the Diels–Alder reaction of dienes with α,β-unsaturated aldehydes. A solution of formaldehyde in water is applicable as an electrophile. Also, the aldol-type reaction of ketene silyl