Domino C−S/C−N Bond Formation Using Well‐Defined Copper‐Phosphine Complex Catalyst: Divergent Approach to 3‐Sulfenylated Indoles
作者:Ramuel John Inductivo Tamargo、Sung Hong Kim、Yong Rok Lee
DOI:10.1002/adsc.201900612
日期:2019.9.3
3‐thioindoles in good‐to‐excellent yields involving sulfenylation between 2‐nitrocinnamaldehydes and various thiols using a well‐defined copper(I)‐phosphine complex catalyst. This unconventional divergent approach involves in situ generation of indoles via domino C−S/C−N bond formation initiated by sulfa‐Michael addition followed by intramolecular N‐heteroannulation. This protocol shows good chemoselectivity
开发了一种协议,用于使用定义明确的铜(I)-膦络合物催化剂以良好的优异产率合成3-硫代吲哚,涉及2-硝基肉桂醛和各种硫醇之间的亚磺酰基化。这种非常规的发散方法涉及通过磺胺-迈克尔加成反应引发的多米诺骨牌CS / C-N键形成原位生成吲哚,然后分子内进行N-异环化。该方案显示出良好的化学选择性和广泛的底物范围。为简要说明该方法的价值,由市售的2-硝基查尔酮和硫醇制备了2-苯甲酰基-3-亚磺酰化的吲哚。