In the presence of a catalytic amount of palladium(II) chloride, β,β-difluorostyrenes bearing a sulfonamido group at the ortho position were treated with trimethylsilyl trifluoromethanesulfonate to afford oxindoles in high yield. The reactions proceeded via 5-endo-trig cyclization, hydrolysis, and desulfonylation. This sequence allowed the transformation of difluorostyrenes into free oxindoles in a one-pot operation.
在一定量的
氯化钯(II)催化下,在正交位置带有磺酰胺基的β,β-二
氟苯乙烯经
三氟甲磺酸三甲基硅酯处理后,可以得到高产率的羰基
吲哚。反应通过 5-内向-三重环化、
水解和脱磺进行。这一系列反应使得二
氟苯乙烯可以在一次反应中转化为游离的羰基
吲哚。