Rh(III)- and Ir(III)-Catalyzed C–H Alkynylation of Arenes under Chelation Assistance
作者:Fang Xie、Zisong Qi、Songjie Yu、Xingwei Li
DOI:10.1021/ja501910e
日期:2014.3.26
Rh(III)- and Ir(III)-catalyzed, chelation-assisted C-H alkynylation of a broad scope of (hetero)arenes has been developed using hypervalent iodine-alkyne reagents. Heterocycles, N-methoxy imines, azomethine imines, secondary carboxamides, azo compounds, N-nitrosoamines, and nitrones are viable directing groups to entail ortho C-H alkynylation. The reaction proceeded under mild conditions and with controllable
derivatives were prepared by copper-catalyzedcross-coupling of hydroxamates with aryliodides. The reaction conditions are compatible with standard hydroxy-protecting groups on the hydroxylamine moiety and are applicable to a broad range of coupling partners. N-Aryl-O-alkylhydroxamic acid derivatives were prepared by copper-catalyzedcross-coupling of hydroxamates with aryliodides. The reaction conditions
Ruthenium(II) catalysis allowed for regioselective annulations of challenging ferrocenylalkynes by oximes or N‐methoxybenzamides through isohypsicCH/NObondfunctionalization to furnish substituted isoquinolines and NH‐free isoquinolones with ample scope.
允许由肟或挑战ferrocenylalkynes的区域选择性annulations钌(II)催化Ñ -methoxybenzamides通过isohypsicÇ H /Ñ O键的官能化,得到取代的异喹啉和NH -free异喹诺酮与足够的范围。
Formal Lossen Rearrangement/Alkenylation or Annulation Cascade of Heterole Carboxamides with Alkynes Catalyzed by CpRh
<sup>III</sup>
Complexes with Pendant Amides
作者:Takayuki Yamada、Yu Shibata、Ken Tanaka
DOI:10.1002/chem.201904156
日期:2019.12.13
It has been established that a cyclopentadienyl (Cp) RhIII complex with two aryl groups and a pendant amide moiety catalyzes the formal Lossen rearrangement/alkenylation cascade of N-pivaloyl heterole carboxamides with internal alkynes, leading to alkenylheteroles. Interestingly, the use of sterically demanding internal alkynes afforded not the alkenylation but the [3+2] annulation products ([5,5]-fused
Rh[III]-Catalyzed C–H Amidation Using Aroyloxycarbamates To Give <i>N</i>-Boc Protected Arylamines
作者:Christoph Grohmann、Honggen Wang、Frank Glorius
DOI:10.1021/ol401209f
日期:2013.6.21
The Rh(III)-catalyzed amidation of C(sp(2))-H bonds by the use of electron-deficient aroyloxycarbamates as efficient electrophilic amidation partners is reported. The reaction proceeded under mild conditions with broad functional group tolerance, and pyridine and O-methyl hydroxamic acids serve as efficient directing groups, giving access to valuable N-Boc protected arylamines (also Fmoc and Cbz). Preliminary mechanistic experiments are discussed.