Highly enantioselective synthesis of cyclic sulfamidates and sulfamidesviarhodium-catalyzed transfer hydrogenation
作者:Sun Ah Lee、Se Hun Kwak、Kee-In Lee
DOI:10.1039/c0cc04166a
日期:——
We achieved highly enantioselective synthesis of cyclic 1,2-sulfamidates and -sulfamides viarhodium-catalyzed transfer hydrogenation, and also revealed one-pot preparation of cyclic N-sulfonylimines from α-hydroxy ketones.
Domino reaction of cyclic sulfamidate imines with Morita–Baylis–Hillman acetates promoted by DABCO: a metal-free approach to functionalized nicotinic acid derivatives
作者:Debashis Majee、Soumen Biswas、Shaikh M. Mobin、Sampak Samanta
DOI:10.1039/c7ob00240h
日期:——
nitrile or an acetyl group at the C-3 position in good to excellent yields via a domino SN2/elimination/6π-aza-electrocyclization/aromatization reaction of several 4-aryl/hetero-aryl-substituted 5-membered cyclic sulfamidate imines with a broad range of MBH acetates of acrylate/acrylonitrile/MVK in 2-MeTHF promoted by DABCO as an organobase under an O2 atmosphere. Moreover, a biologically interesting triazolopyridine
Metal- and Solvent-Free Approach to Diversely Substituted Picolinates via Domino Reaction of Cyclic Sulfamidate Imines with β,γ-Unsaturated α-Ketocarbonyls
An efficient, solvent-free, and eco-friendly domino reaction of 5/6-membered cyclic sulfamidate imines with a variety of β,γ-unsaturated α-ketocarbonyls in neat conditions under MW irradiation promoted by DABCO as a solid organobase has been developed for the rapid construction of a novel class of densely functionalized picolinates. This interesting metal–solvent-free tactic allows a wide range of
在DABCO促进的MW辐射下,在纯净条件下,开发了5/6元环状氨基磺酸亚胺与各种β,γ-不饱和α-酮羰基化合物的高效,无溶剂,生态友好的多米诺反应,该反应是由DABCO促进的,作为固体有机碱用于快速构建新型的高密度官能化的吡啶甲酸类化合物。这种有趣的无金属溶剂策略可在芳基环上提供多种有用的功能,并能在较短的时间间隔(20-40分钟)内,将上述氮杂杂环化合物的收率很好地提高。通过我们独特的方法成功合成了具有生物学前途的咪唑并[1,2- a ]吡啶。
Asymmetric synthesis of gem-diaryl substituted cyclic sulfamidates and sulfamides by rhodium-catalyzed arylation of cyclic ketimines
Asymmetric addition of arylboronates to aryl-substituted cyclic ketimines proceeded in the presence of a rhodium catalyst coordinated with a chiral diene ligand to give high yields of sulfamidates and sulfamides with high enantioselectivity (up to 99% ee).
1,6-Addition of vinyl <i>p</i>-quinone methides with cyclic sulfamidate imines: access to 4-hydroxyaryl-2,6-diarylpyridines
作者:Soumitra Guin、Santosh K. Gudimella、Sampak Samanta
DOI:10.1039/c9ob02708d
日期:——
wide range of symmetrically and unsymmetrically 2,4,6-trisubstitutedpyridines possessing a sterically hindered phenolic moiety at the C4-position with a broad substrate scope. This domino [3 + 3] cyclization reaction gives rise to several compatible functionalities under metal-free conditions. Finally, the large-scale synthesis of pyridinederivatives has been demonstrated.