作者:Thorsten Bach、Jörg Hehn、Diego Gamba-Sánchez、Michael Kemmler、Martin Fleck、Birte Basler
DOI:10.1055/s-0029-1218793
日期:2010.7
an intra- or intermolecular [2+2]-photocycloaddition reaction. Typical reaction conditions are irradiation at λ = 254 nm in diethyl ether or an alcohol as the solvent. The bi-, tri- or tetracyclic products so obtained can be further utilized by ring opening either of the lactone or the cyclobutane ring. Lactone ring opening led to the use of a tetramide photocycloaddition product as a conformationally
可容易地从相应的tetronic酸获得的tetronic酸酯和酰胺在分子内或分子间[2 + 2]-光环加成反应中用作有用的原料。典型的反应条件是在二乙醚或乙醇作为溶剂中于λ= 254 nm进行辐照。如此获得的双,三或四环产物可通过内酯或环丁烷环的开环进一步利用。内酯开环导致四酰亚胺光环加成产物作为构象受限的β-脯氨酸类似物的使用,并导致四环素光环加成产物在点孢菌素C的全合成中的应用。 [2 + 2]环加成物-环丁烷-非对映选择性-杂环-光化学