Organocatalytic
<i>Trans</i>
Semireduction of Primary and Secondary Propiolamides: Substrate Scope and Mechanistic Studies
作者:R. Justin Grams、Monsurat M. Lawal、Connor Szwetkowski、Daniel Foster、Carol Ann Rosenblum、Carla Slebodnick、Valerie Vaissier Welborn、Webster L. Santos
DOI:10.1002/adsc.202101020
日期:2022.1.4
We report a chemoselective, phosphine-catalyzed semireduction of primary and secondary propiolamides. In the presence of stoichiometric pinacolborane and catalytic n-tributylphosphine, a variety of propiolamides were successfully converted to the corresponding acrylamides in excellent yield with (E)-stereoselectivity. The reaction condition is tolerant of various functional groups including alkene
我们报告了初级和次级丙酰胺的化学选择性、膦催化的半还原反应。在化学计量的频哪醇硼烷和催化正三丁基膦的存在下,各种丙酰胺以优异的收率成功转化为相应的丙烯酰胺,具有(E)-立体选择性。反应条件可以容忍各种官能团,包括烯烃、炔烃、酮或酯。氘标记研究表明,来自活化频哪醇硼烷的氢化物被添加到 α-碳,酰胺氮上的质子被 β-碳提取以提供 ( E )-丙烯酰胺。DFT 计算揭示了 ( E )- 在 ( Z)-异构体。
Modulators of Caspase-6
申请人:The University of British Columbia
公开号:US20190192524A1
公开(公告)日:2019-06-27
Modulators of caspase-6 activity are provided for use in the treatment of neurodegenerative diseases.
Preparation of Arylpropynamides and Their Reaction with Malonyl Acid Derivatives
作者:Olga Petina、Igor Yakovlev、Detlef Geffken
DOI:10.1055/s-0032-1316851
日期:——
4-hydroxy-2-(phenylethynyl)-6H-1,3-oxazin-6-ones; and the reaction of arylpropynamides with disubstituted malonyl chlorides furnished open-chain arylpropenamides exclusively. Synthesis of arylpropynamides and their reactions with different malonic acidderivatives is described. Treatment of arylpropynamides with unsubstituted malonyl chloride furnished N-(3-arylprop-2-ynoyl)-6-chloro-4-hydroxy-2-oxo-2H-pyran-3-carboxamides;
Catalytic, Transition-Metal-Free Semireduction of Propiolamide Derivatives: Scope and Mechanistic Investigation
作者:R. Justin Grams、Christopher J. Garcia、Connor Szwetkowski、Webster L. Santos
DOI:10.1021/acs.orglett.0c02567
日期:2020.9.4
We report a transition-metal-free trans-selective semireduction of alkynes with pinacolborane and catalytic potassium tert-butoxide. A variety of 3-substituted primary and secondary propiolamides, including an analog of FK866, a potent nicotinamide mononucleotide adenyltransferase (NMNAT) inhibitor, are reduced to the corresponding (E)-3-substituted acrylamide derivatives in up to 99% yield with >99:1
我们报道了频哪醇硼烷和催化叔丁醇钾对炔烃的无过渡金属反式选择性半还原。各种 3-取代的一级和二级丙炔酰胺,包括 FK866 的类似物(一种有效的烟酰胺单核苷酸腺苷酸转移酶 (NMNAT) 抑制剂),可被还原为相应的 ( E )-3-取代的丙烯酰胺衍生物,产率高达 99%,且 >99 :1 E / Z选择性。机理研究表明,活化的路易斯酸碱配合物将氢化物转移到α-碳上,然后以反式方式快速质子化。