Nonaflates from 8-Oxabicyclo[3.2.1]oct-6-en-3-ones as Building Blocks for Diversity-Orientated Synthesis: Preparation, Heck-Couplings and Subsequent Diels-Alder Reactions
作者:Jens Högermeier、Hans-Ulrich Reissig、Irene Brüdgam、Hans Hartl
DOI:10.1002/adsc.200404194
日期:2004.12
substituted furan derivatives was observed. Several Diels–Alder reactions of the bicyclic dienes were conducted leading to polycyclic compounds. Whereas the diastereofacial selectivity with respect to the oxygen or sulfur bridge of the dienes is excellent, the exo/endo selectivity strongly depends on the substitution patterns of the bicyclic diene and the dienophile. The results presented demonstrate
通过将相应的8-氧杂双环[3.2.1] oct-6-en-3-ones和硫相对于LDA脱质子化,然后用九氟丁烷磺酰氟(NfF)捕集,可以高收率制备一系列双环烯基壬酸酯。所得化合物在标准条件下经历与丙烯酸甲酯的Heck偶联,通常以令人满意的产率提供双环二烯。对于壬二酸酯2和12,观察到了对取代的呋喃衍生物的新的碱促进的断裂反应。进行了双环二烯的数个Diels-Alder反应,生成了多环化合物。相对于二烯的氧桥或硫桥的非对映选择性非常好,而exo / endo选择性很大程度上取决于双环二烯和亲二烯体的取代方式。提出的结果证明了双环壬酸酯有潜力在面向多样性的合成中用作通用构建基块。