Stereoselective Synthesis of Tetrahydrofurans via Formal [3+2]-Cycloaddition of Aldehydes and Allylsilanes. Formal Total Synthesis of the Muscarine Alkaloids (−)-Allomuscarine and (+)-Epimuscarine
作者:Steven R. Angle、Nahla A. El-Said
DOI:10.1021/ja012193b
日期:2002.4.1
The stereoselective synthesis of tetrahydrofurans was achieved by formal [3+2]-cycloaddition of allyl and crotylsilanes with alpha-triethylsilyloxy aldehydes. The scope of the reaction was examined by using different alpha-substituted aldehydes and different substituents on the silicon. Tamao oxidation of the products resulted in formation of diols that are easily functionalized allowing an entry to
四氢呋喃的立体选择性合成是通过烯丙基和巴豆基硅烷与 α-三乙基甲硅烷氧基醛的正式 [3+2]-环加成实现的。通过在硅上使用不同的α-取代的醛和不同的取代基来检查反应的范围。产物的 Tamao 氧化导致形成易于官能化的二醇,从而允许进入天然产物合成。毒蕈碱生物碱(-)-异毒蕈碱和(+)-表毒蕈碱实现了正式全合成。