Iron-Catalyzed Ring-Opening Azidation and Allylation of O-Heterocycles
摘要:
We have established the first catalytic C-C and C-N bond formation reactions of O-heterocycles (e.g., tetrahydrofuran, phthalane, and lactone derivatives) using iron bichloride as a catalyst in the presence of TMSN3 or allylsilanes accompanied by the ring opening of O-heterocycles. The reactions smoothly proceeded at room temperature to give the corresponding primary saturated alcohols from the 2-substituted tetrahydrofurans, ortho-substituted benzyl alcohols from phthalanes, and saturated carboxylic acids from lactones in high yields.
Dual Photoredox/Copper Catalysis for the Remote C(sp<sup>3</sup>
)−H Functionalization of Alcohols and Alkyl Halides by <i>N</i>
-Alkoxypyridinium Salts
作者:Xu Bao、Qian Wang、Jieping Zhu
DOI:10.1002/anie.201813356
日期:2019.2.11
Under mild dual photoredox/copper catalysis, the reaction of N‐alkoxypyridinium salts with readily available silyl reagents (TMSN3, TMSCN, TMSNCS) afforded δ‐azido, δ‐cyano, and δ‐thiocyanato alcohols in high yields. The reaction went through a domino process involving alkoxy radical generation, 1,5‐hydrogen atom transfer (1,5‐HAT) and copper‐catalyzed functionalization of the resulting C‐centered