Organocatalytic Mukaiyama Mannich Reactions of 2,5-Bis(trimethylsilyloxy)furan
作者:Stephen W. Laws、Sara Y. Howard、Raquel Mato、Shuyu Meng、James C. Fettinger、Jared T. Shaw
DOI:10.1021/acs.orglett.9b01664
日期:2019.7.5
The organocatalytic synthesis of densely substituted mono- and bis-γ-lactams involving the Mukaiyama Mannich addition of 2,5-bis(trimethylsilyloxy)furan to imines is described. Use of a ditoluenesulfonylimide catalyst produces γ-lactams from monoaddition, whereas a more acidic catalyst (triflic acid) produces fused bis-lactams from double addition. Optimized organocatalytic conditions allow for the
Highly Diastereoselective Synthesis of β-Carboxy-γ-lactams and Their Ethyl Esters via Sc(OTf)<sub>3</sub>-Catalyzed Imino Mukaiyama-Aldol Type Reaction of 2,5-Bis(trimethylsilyloxy)furan with Imines
Functionalized γ-lactams are found to be crucial intermediates in the synthesis of biologically important natural products. We herein described a highly diastereoselective synthesis of β-carboxy-γ-lactams and their ethyl ester derivatives, in high yields with high diastereomeric ratio, via the Mukaiyama-aldol type reaction of 2,5-bis(trimethysilyloxy)furan with imines, employing Sc(OTf)3 as a catalyst.
Chemistry of 2,5-bis(trimethylsiloxy)furans. III: Synthesis of γ-hydroxybutenolides
作者:Peter Brownbridge、Tak-Hang Chan
DOI:10.1016/s0040-4039(00)78707-7
日期:1980.1
γ-Hydrobutenolides were obtained from the reaction of substituted 2,5- bis(trimethylsiloxy)furans with aldehydes and ketones using titanium tetrachloride activation. Similarly, α,β-unsaturated carbonyl compounds reacted as a Michael receptor with the title compounds to give γ-hydroxybutenolides.
Chemistry of 2,5-bis(trimethylsiloxy) furans. I: Preparation and diels-alder reactions
作者:Peter Brownbridge、Tak-Hang Chan
DOI:10.1016/s0040-4039(00)78705-3
日期:1980.1
A number of substituted 2,5-bis (trimethylsioloxy) furans were prepared from the corresponding succinic anhydrides, and were found to be reactive dienes for the Diels-Alder reaction with electron - withdrawing dienophiles, giving p-quinones and hydroquinones.
Chemistry of 2,5-bis(trimethylsiloxy)furans. II: Reactions with carbonyl compounds and the synthesis of 2,6-diaryl-3,7-dioxabicyclo[3.3.0]octane-4,8-diones
作者:Peter Brownbridge、Tak-Hang Chan
DOI:10.1016/s0040-4039(00)78706-5
日期:——
2,5-Bis(trimethylsiloxy)furan reacted with a number of substituted benzaldehydes under activation of titanium tetrachloride to give 2,6-diaryl- 3,7-dioxabicyclo[3.3.0]octane-4,8-diones.