Stereoselectivity in intramolecular 1,3-dipolar cycloadditions. Nitrile oxides versus silyl nitronates
作者:W. Dehaen、A. Hassner
DOI:10.1016/s0040-4039(00)94618-5
日期:1990.1
Unlike nitrileoxides, silyl nitronates undergo highly stereoselective intramolecularcycloadditions to produce functionalized carbocyclic or heterocyclic rings.
与腈氧化物不同,甲磺酸硅烷基酯会经历高度立体选择性的分子内环加成反应,以生成功能化的碳环或杂环。
Cycloadditions, 55. – Substituent Effects in Tandem Intramolecular Silyl Nitronate Olefin Cycloadditions (ISOC) Leading to Functionalized Tetrahydrofurans
作者:Alfred Hassner、Oded Friedman、Wim Dehaen
DOI:10.1002/jlac.199719970321
日期:1997.3
leading to substituted, fused-ring tetrahydrofurans 6 was examined with regard to optimum conditions and substituent effects. The required unsaturated nitro ethers 3 resulted from low-temperature, base-mediated Michael addition of allyl alcohols 2 to nitroolefins 1, followed by conversion to unsaturated silyl nitronates 4. Cycloaddition of the latter and elimination of silanol provided 6. One-pot tandem