YTTERBIUM METAL PROMOTED ALLYLATION OF DISULFIDES WITH ALLYL BROMIDE
摘要:
In the presence of a catalytic amount of methyliodide, ytterbium metal can promote the reductive cleavage of the S-S bond in disufides I to give ytterbium thiolates 2 which then react with allyl bromide to form the corresponding allylic sulfides 3 in good yields under mild and neutral conditions.
precursors in reactions with thioethers under the catalysis of a commercially available Ru(II) complex, from which a variety of sulfimides were synthesized efficiently and mildly. If an allyl group is contained in the thioether precursor, the [2,3]-sigmatropic rearrangement of the sulfimide occurs simultaneously and the N-allyl-N-(thio)amides were obtained as the final products. Preliminary mechanistic studies
Syntheses of 4-allyl-/4-allenyl-4-(arylthio)-1,4-dihydroisoquinolin-3-ones <i>via</i> the photochemical Doyle–Kirmse reaction
作者:Jianwei Xie、Muhammad Suleman、Zaibin Wang、Xinfei Mao、Beibei Mao、Jiale Fan、Ping Lu、Yanguang Wang
DOI:10.1039/d1ob00859e
日期:——
Facilesynthesis of 4-allyl-/4-allenyl-4-(arylthio)-1,4-dihydroisoquinolin-3-ones via the visible-light-induced Doyle–Kirmse reaction of 4-diazo-1,4-dihydroisoquinolin-3-ones with allyl-/propargyl sulfides is reported. The reaction proceeds via the generation of free carbenes from cyclic diazo compounds followed by in situ formation of sulfonium ylide intermediates, which subsequently undergo [2,3-sigmatropic
3-allyl/3-allenyl-3-(thio)oxindole core remains a challenge in organic synthesis. Herein, we report a novel Rh2(esp)2 catalytic Doyle–Kirmse reaction to furnish the oxindole core, bearing unbiased NH as well as a quaternary stereogenic center at the 3-position, in good to excellent yields under mild conditions. These reactions are concise, practical, atom-economic, and highly efficient, and feature a TON