作者:Miguel Yus、Rosario Torregrosa、Isidro Pastor
DOI:10.3390/90500330
日期:——
The protocol of lithiation by means of lithium and a catalytic (5% molar) amount of DTBB (4,4’-di-tert-butylbiphenyl), applied to ω-chloro ortho ester 6 under Barbier-type conditions gives, after final acid-catalyzed methanolysis, the corresponding functionalized esters 8 or 9 (for chlorotrimethylsilane as electrophile) or, after ortho ester deprotection and acid catalyzed treatment, the δ-lactones 11. The procedure is also practical for bicyclic ortho esters 14: the β-chloro OBO ester derivate generates the γ- lactones 15 and the γ-chloro OBO ester gives corresponding esters 8.
通过锂和催化量(5%摩尔)的DTBB(4,4'-二叔丁基联苯)进行锂化反应的协议,应用于ω-氯代原酸酯6在Barbier型条件下,经最终酸催化的甲醇分解反应,得到相应的功能化酯8或9(以氯三甲基硅烷为亲电试剂),或经过原酸酯脱保护和酸催化处理,得到δ-内酯11。该方法也适用于双环原酸酯14:β-氯代OBO酯衍生物产生γ-内酯15,而γ-氯代OBO酯则得到相应的酯8。