derivative 15 affording a mixture of six isomers which was fully assigned by NMR spectroscopy. The mixture was directly converted into the final compounds in an efficient base-catalyzed cyclization reaction. A base-catalyzed interconversion between the two isomers was observed.
螺核苷-2'- deoxyhydantocidin的合成图3a及其1'-差向异构体3b中进行了描述。新开发的路线涉及
膦酸酯16与赤藓糖衍
生物15的霍纳-沃兹沃思-埃蒙斯缩合反应,得到六种异构体的混合物,这是由NMR光谱法完全确定的。在有效的碱催化环化反应中,将混合物直接转化为最终化合物。观察到两种异构体之间的碱催化的相互转化。