The Iridium‐catalyzedasymmetrichydrogenation of cyclic sulfamidate imines was successfully developed with N‐methylated ZhaoPhos L2 as the ligand. A variety of chiral cyclic sulfamidates were obtained with excellent results (up to 99% yield, 99% ee). Furthermore, this asymmetrichydrogenation can be employed as the key reaction step to prepare the important intermediates in organic synthesis.
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
Access to 4,6-Diarylpicolinates via a Domino Reaction of Cyclic Sulfamidate Imines with Morita–Baylis–Hillman Acetates of Nitroolefins/Nitrodienes
作者:Debashis Majee、Soumen Biswas、Shaikh M. Mobin、Sampak Samanta
DOI:10.1021/acs.joc.6b00472
日期:2016.5.20
An interesting domino reaction of 5-membered cyclic sulfamidate imines with a variety of Morita–Baylis–Hillman acetates of nitroolefins/nitrodienes in the presence of DABCO as an organic base at 55 °C is reported for the first time. This new synthetic strategy provides a series of pharmacologically interesting 4,6-diarylpicolinates in high to excellent yields and allows several compatible functionalities
首次报道了在55°C下DABCO作为有机碱存在下,五元环状氨基磺酸亚胺与各种森田-贝利斯-希尔曼的硝基烯烃/硝基二烯乙酸酯发生有趣的多米诺反应。这种新的合成策略以高产率至优异产率提供了一系列药理学上令人感兴趣的4,6-二芳基吡啶甲酸,并允许在芳基环上实现多种相容性官能团。此外,已经通过独特的方法以高化学产率制备了生物学上令人感兴趣的咪唑并[1,2- a ]吡啶(嘧啶衍生物)。
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。
Enantioselective Rh(I)-Catalyzed Addition of Arylboronic Acids to Cyclic Ketimines
A method for the enantioselective synthesis of chiral α-tertiary amines via Rh-catalyzed 1,2-addition of arylboronicacids to cyclic ketimines is described. The products are efficiently accessed in good yields and excellent enantioselectivities using a commercially available chiral ligand. The reaction scope includes vinyl, aryl, and heteroarylboronic acids with yields ranging from 40% to 99% and enantiomeric