A direct approach to amines with remote stereocentres by enantioselective CuH-catalysed reductive relay hydroamination
作者:Shaolin Zhu、Nootaree Niljianskul、Stephen L. Buchwald
DOI:10.1038/nchem.2418
日期:2016.2
elements in many pharmaceutical agents and natural products. However, previously reported methods to prepare these compounds in an enantioselective manner are indirect and require multistep synthesis. Here, we report a copper-hydride-catalysed, enantioselectivesynthesis of γ- or δ-chiral amines from readily available allylic alcohols, esters and ethers using a reductive relay hydroamination strategy (a
The preparation and reactivity of new solid heterocyclic organozinc reagents, namely N-protected (1H-tetrazol-5-yl)zinc pivalates, as storable solids with appreciably air and moisture stability are reported. They are obtained in high yields from protected 1H-tetrazoles by deprotonation using the mixed zinc–magnesium base TMPZnCl·Mg(OPiv)2 (abbreviated as TMPZnOPiv; TMP = 2,2,6,6-tetramethylpiperidyl)
Functionalization of 1,3,4-Oxadiazoles and 1,2,4-Triazoles via Selective Zincation or Magnesiation Using 2,2,6,6-Tetramethylpiperidyl Bases
作者:Kuno Schwärzer、Carl Phillip Tüllmann、Simon Graßl、Bartosz Górski、Cara E. Brocklehurst、Paul Knochel
DOI:10.1021/acs.orglett.0c00238
日期:2020.3.6
We report the metalation of the 1,3,4-oxadiazole and 1,2,4-triazole scaffolds via regioselective zincation or magnesiation using the TMP bases (TMP = 2,2,6,6-tetramethylpiperidyl) TMP2Zn·2LiCl, TMP2Zn·2MgCl2·2LiCl, TMPMgCl·LiCl, and TMPZnCl·LiCl under mild conditions in THF. Subsequent trapping with various electrophiles including hydroxylamino benzoates gives access to functionalized heterocycles
Copper-Catalyzed <i>ortho</i>-Selective Dearomative C–N Coupling of Simple Phenols with <i>O</i>-Benzoylhydroxylamines
作者:Zhi-Li Yao、Lei Wang、Nan-Qi Shao、Yin-Long Guo、Dong-Hui Wang
DOI:10.1021/acscatal.9b01317
日期:2019.8.2
exclusively at the positionortho to the hydroxyl group, providing a convenient method to synthesize the desired products in high yields. The reaction proceeds under mild conditions and tolerates a wide range of functional groups. Mechanistic studies indicate that this transformation proceeds via either (1) a single-electrontransfer process involving attack of an N-centered radical onto the phenol or
Enantioselective CuH-Catalyzed Anti-Markovnikov Hydroamination of 1,1-Disubstituted Alkenes
作者:Shaolin Zhu、Stephen L. Buchwald
DOI:10.1021/ja509786v
日期:2014.11.12
Enantioselective synthesis of β-chiral amines has been achieved viacopper-catalyzedhydroamination of 1,1-disubstituted alkenes with hydroxylamine esters in the presence of a hydrosilane. This mild process affords a range of structurally diverse β-chiral amines, including β-deuterated amines, in excellent yields with high enantioselectivities. Furthermore, catalyst loading as low as 0.4 mol% could