1,8-二氮杂双环[5.4.0]十一碳烯(DBU)在环境条件下在大气氧存在下促进了苯甲酰胺的氧化环化。已经在各种条件下研究了该反应,并提出了合理的机理。这种“绿色”反应是通过酰胺的分子内闭环进行的,随后与分子氧反应,其中DBU发挥了关键作用。在氧气气氛下,在乙腈中用DBU处理多种苯甲酰胺,以高收率得到对称/不对称的3,4-二芳基取代的马来酰亚胺。然而,当K 2 CO 3时,获得了相应的吡咯啉-2-酮,收率为好至极好。 用DBU代替DBU,可实际合成具有潜在生物学意义的这些化合物。
A Palladium-Catalyzed Cascade C–C Activation of Cyclopropenone and Carbonylative Amination: Easy Access to Highly Functionalized Maleimide Derivatives
作者:Tanmayee Nanda、P. C. Ravikumar
DOI:10.1021/acs.orglett.9b04656
日期:2020.2.21
We describe herein the first report on palladium-catalyzed C-C bond activation of cyclopropenone and concomitant carbonylative amination to produce maleimides. The interesting aspect of this reaction is that the sacrificial elimination of carbon monoxide from the substrate is efficiently recaptured by one of the intermediates in the catalytic cycle for the formation of maleimides. 18O isotopic studies
New compounds for inhibiting differentiation of osteoclast and pharmaceutical composition comprising thereof
申请人:METACINE, INC.
公开号:US20140031563A1
公开(公告)日:2014-01-30
New compounds and pharmaceutical compositions comprising active ingredients having inhibition effects on osteoclast differentiation are provided. The pharmaceutical compositions comprising the new compounds can be used as medicines for treating metabolic bone diseases such as bone metastatic cancer, solid cancer bone metastasis, musculoskeletal complication by solid cancer bone metastasis, hypercalcemia by malignant tumor, multiple myeloma, primary bone tumor, osteoporosis, rheumatoid arthritis, osteoarthritis, periodontal disease, inflammatory resorption of alveolar bone, inflammatory resorption of bone, and Paget's disease.
Phosphine-catalyzed activation of cyclopropenones: a versatile C<sub>3</sub> synthon for (3+2) annulations with unsaturated electrophiles
作者:Xin He、Pengchen Ma、Yuhai Tang、Jing Li、Shenyu Shen、Martin J. Lear、K. N. Houk、Silong Xu
DOI:10.1039/d2sc04092a
日期:——
α-ketenyl phosphorous ylide is validated as the key intermediate, which undergoes preferential catalytic cyclization with aldehydes rather than stoichiometric Wittig olefinations. This phosphine-catalyzed activation of cyclopropenones thus supplies a versatile C3 synthon for formal cycloadditon reactions.