A solid-phase synthetic method for 3,4-dihydro-1H-2,1-benzothiazin-4-one 2,2-dioxide derivatives
作者:Moon-Kook Jeon、Myung-Su Kim、Jeong-Jin Kwon、Young-Dae Gong、Duck-Hyung Lee
DOI:10.1016/j.tet.2008.07.031
日期:2008.9
Utilizing polymer-bound anthranilic acid derivatives, we were able to obtain 3,4-dihydro-1H-2,1-benzothiazine-4-one 2,2-dioxide derivatives through N-methanesulfonylation by use of sulfonyl chloride, sulfonic acid, or sodium sulfonate, N-alkylation under Mitsunobu condition, and the cyclative cleavage in 8–52% five-step overall isolated yields and 91–99% purities from Wang resin. The reactions on solid
利用聚合物结合的邻氨基苯甲酸衍生物,我们能够得到3,4-二氢-1- ħ -2,1苯并噻嗪-4-酮通过使用磺酰氯,磺酸的N-甲磺酰-2,2-二氧化物的衍生物,或磺酸钠,在Mitsunobu条件下进行N烷基化,并从Wang树脂中分离出8-52%的五步总分离产率和91-99%的纯度的环解。固相反应通过珠上ATR-FTIR光谱法进行监测,并借助溶液相模型实验进行检查。