不利的热力学常常使呋喃不愿参与高产的Diels-Alder(DA)环加成反应。在这里,我们报告了生物来源的反应物衣康酸酐(IA)和糠醇(FA)高效转化为单一的DA加合物。酸酐开环和产物的晶格能提供的自由能优势克服了呋喃二烯芳香性的损失。详细的1 H NMR研究提供了有关相关动力学和热力学特征的宝贵见解。
Compounds of formula III:
and salts thereof are disclosed. Also disclosed are methods for preparing compounds of formula III, intermediates useful for preparing compounds of formula III and methods for preparing compounds and materials from compounds of formula III.