Synthesis of 3-Sulfonylamino Quinolines from 1-(2-Aminophenyl) Propargyl Alcohols through a Ag(I)-Catalyzed Hydroamination, (2 + 3) Cycloaddition, and an Unusual Strain-Driven Ring Expansion
We describe herein a silver-catalyzed conversion of 1-(2-aminophenyl)-propargyl alcohols to 4-substituted 3-tosylaminoquinolines using TsN3 as an amino surrogate. Controlled reactions reveal the pathway consisting of Ag(I)-catalyzed 5-exo-dig cyclization, catalyst-free (2 + 3) cycloaddition, and ring-expansive rearrangement via nitrogen expulsion. As a support study, we show that the cyclic enamines
2H-chromenes has been established that uses 1,1′-binaphthyl-2,2′-diyl hydrogen phosphate (BiNPO4H) as the catalyst and gives excellent diastereoselectivities (≥19:1 dr) in most cases. This protocol has a high compatibility with various substituents of substrates, offering a catalytic and useful entry to the fabrication of the syntheticallyimportant C2-functionalized 2H-chromene scaffold.
已经建立了一种新的 Brønsted 酸催化炔丙醇与吖内酯的氧合环化以合成 C 2 -吖内酯化的2 H -色烯,其使用 1,1'-联萘-2,2'-磷酸氢二酯 (BiNPO 4 H) 作为在大多数情况下,催化剂具有出色的非对映选择性(≥19:1 dr)。该协议与底物的各种取代基具有高度相容性,为合成重要的 C 2 -功能化2 H -色烯支架的制造提供了催化和有用的入口。