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。
Copper-catalyzed tandem annulation/arylation for the synthesis of diindolylmethanes from propargylic alcohols
作者:Hui Li、Xiaoxun Li、Hao-Yuan Wang、Gabrielle N. Winston-McPherson、Hao-miao Julie Geng、Ilia A. Guzei、Weiping Tang
DOI:10.1039/c4cc05901h
日期:——
Various highly substituted 2,3′-diindolylmethane heterocycles were prepared from propargylic alcohols and indole nucleophiles via a transition metal-catalyzed tandem indole annulation/arylation reaction for the first time. Among the metal catalysts we examined, the most economical copper(I) catalyst provided the highest efficiency. The indole nucleophiles could also be replaced by other electron-rich arenes or alcohols.
Divergent Reactivity of Rhodium(I) Carbenes Derived from Indole Annulations
作者:Xiaoxun Li、Hui Li、Wangze Song、Po‐Sen Tseng、Lingyan Liu、Ilia A. Guzei、Weiping Tang
DOI:10.1002/anie.201505329
日期:2015.10.26
carbenes were generated from propargylic alcohol derivatives as the result of a dehydrative indole annulation. Depending on the choice of the electron‐withdrawing group on the aniline nitrogen nucleophile, either a cyclopropanation product or dimerization product was obtained chemoselectively. Intramolecular hydroamidation occurred for the same type of propargylic alcohol derivatives when other transition‐metal