从乙烯基碳酸乙烯酯和双磺酰甲烷开始,已经完成了一种用于合成高度官能化的环戊烯醇的有效的一锅法。该协议通过顺序钯催化脱羧烯丙基化和氧化环化以操作简单的方式进行。广泛的底物可以很好地适应各种环戊烯醇,以中等至良好的产率和优异的选择性。进一步的对照实验表明,可分离的 ( Z )-烯丙醇(高达Z / E = >19:1)的选择性形成是后续级联氧化环化成功的基础。
Sc(OTf)3-Catalyzed Synthesis of Symmetrical Dithioacetals and Bisarylmethanes Using Nitromethane as a Methylene Source
摘要:
Use of nitromethane as an electrophilic methylene source for the synthesis of symmetrical dithioacetals and bisarylmethanes has been showcased using Sc(OTf)(3) as a catalyst. The procedure allows straightforward access to the densely functionalized dithioacetals and bisarylmethanes under mild conditions. Additionally, the method has been applied for the synthesis of antimalarial tetramethyl mellotojaponin C and anticancer dimeric phloroglucinol derivative.