Nickel/(S)-t-Bu-PHOX complexcatalyzedasymmetric arylative cyclization of N-alkynones has been achieved, delivering 1,2,3,6-tetrahydropyridines containing a chiral tertiary alcohol in high yields and excellent enantioselectivities, which provides efficient access to chiral tetrahydropyridine and piperidine analogues.
已实现镍/( S )- t -Bu-PHOX 复合物催化N -炔酮的不对称芳基化环化,以高产率和优异的对映选择性提供含有手性叔醇的 1,2,3,6-四氢吡啶,从而提供有效的获取手性四氢吡啶和哌啶类似物。
Cobalt-catalyzed (Z)-selective semihydrogenation of alkynes with molecular hydrogen
A cobalt-catalyzed highly (Z)-selective semihydrogenation of alkynes using molecular H2 was developed using commercially available and cheap cobalt precursors. A variety of (Z)-alkenes were obtained in moderate to excellent selectivities...
Rh<sup>I</sup>-Catalyzed Cycloisomerization of Vinyl Bicyclopropyl Compounds to Azabicyclo[3.2.2]nona-2,8-dienes
作者:Sun Young Kim、Youn K. Kang、Young Keun Chung
DOI:10.1002/chem.200902284
日期:2010.5.10
Nitrogen‐containing heterobicycles are an important structural motif ubiquitous in natural alkaloids. We found that azabicyclo[3.2.2]nona‐2,8‐dienes can be synthesized from vinyl bicyclopropropyl derivatives in the presence of a RhI catalyst (see scheme). Syntheses of such compounds and an investigation into the reaction mechanism through DFT calculations are presented.
Copper‐Catalyzed Azide–Ynamide Cyclization to Generate α‐Imino Copper Carbenes: Divergent and Enantioselective Access to Polycyclic N‐Heterocycles
作者:Xin Liu、Ze‐Shu Wang、Tong‐Yi Zhai、Chen Luo、Yi‐Ping Zhang、Yang‐Bo Chen、Chao Deng、Rai‐Shung Liu、Long‐Wu Ye
DOI:10.1002/anie.202007206
日期:2020.10.5
Here an efficient copper‐catalyzed cascade cyclization of azide‐ynamides via α‐imino copper carbene intermediates is reported, representing the first generation of α‐imino copper carbenes from alkynes. This protocol enables the practical and divergent synthesis of an array of polycyclic N‐heterocycles in generally good to excellent yields with broad substrate scope and excellent diastereoselectivities
Gold(I)-Catalyzed 6-<i>endo</i>-Dig Hydrative Cyclization of an Alkyne-Tethered Ynamide: Access to 1,6-Dihydropyridin-2(3<i>H</i>)ones
作者:Nayan Ghosh、Sanatan Nayak、Akhila K. Sahoo
DOI:10.1002/chem.201301599
日期:2013.7.15
Hydrate your chemistry! Hydrativecyclization of 5‐yne‐ynamides in the presence of Echavarren's catalyst and p‐toluenesulphonic acid (PTSA)⋅H2O at room temperature affords an array of 1,6‐dihydropyridin‐2(3H)one derivatives. Isomerization, epoxidation, and hydrogenation of the double bond and insertion of an extended π‐conjugate system into the pyridinone skeleton have been successfully accomplished