sultams 8a-h in high yields. The chiral spiro sultams 8g, h were subjected to FClO(3) fluorination to give the N-fluorosultams 11a,b, respectively, which were tested for electrophilic asymmetric fluorination of aryl ketone enolates. As a result, the N-fluorosultam 11a exhibited modest asymmetric inducing abilities with the highest ee, reaching 70% for enantioselective fluorination of the lithium enolate
描述了用于3,3-二取代和3,3-螺2H,4H-苯并[e] [1,2]
噻嗪-1,1-二酮8a-h的简便构建的新方法。N-Boc-邻
甲苯磺酰胺6的邻
甲基锂化反应,然后与多种酮反应,得到相应的
甲醇磺酰胺7a-g,将其在酸性(
甲磺酸)或中性(NaI / TMSCl / MeCN)条件下环化为可以高产地提供8a-h的
苏丹娜。将手性螺合磺酰胺8g,h进行FC10(3)
氟化处理,分别得到N-
氟磺酰胺11a,b,将其测试为芳基酮烯醇酸酯的亲电不对称
氟化。结果,N-
氟磺酰胺11a表现出中等的不对称诱导能力,具有最高的ee,对于2-甲基-1-四氢
萘酮的烯醇
锂的对映选择性
氟化达到70%。