Formation of substituted 2-iminooxazolidines via intermolecular 1,2-addition/intramolecular N-vinylation using 3-substituted-2-bromo-2-propen-1-ols as substrates
摘要:
The Cu2O-catalyzed reaction between equimolar amounts of easily available 3-substituted-2-bromo-2-propen-1-ols and dicyclohexyl carbodiimide in DMSO at 100 degrees C using K3PO4 as the base and in the absence of any additive exclusively delivers substituted 2-iminooxazolidines with yields up to 80%. The highly selective transformation is assumed to start with an intermolecular 1,2-addition, which is followed by an intramolecular N-vinylation. The products can also be obtained in the absence of Cu2O, albeit in lower yields. (C) 2018 Elsevier Ltd. All rights reserved.
Annulation of Enals with Carbamoylpropiolates via NHC-Catalyzed Enolate Pathway: Access to Functionalized Maleimides/Iso-maleimides and Synthesis of Aspergillus FH-X-213
作者:Amol B. Viveki、Mahesh D. Pol、Priyanka Halder、Sameer R. Sonavane、Santosh B. Mhaske
DOI:10.1021/acs.joc.1c00782
日期:2021.7.16
report the N-heterocyclic carbene (NHC)-catalyzed [3 + 2] annulation of α,β-unsaturated aldehydes with carbamoylpropiolates via an unusual enolate pathway leading to the construction of highly functionalized maleimides or isomaleimides. The electronic effect imposed by the alkyl/aryl group present on the amide nitrogen of carbamoylpropiolates plays a crucial role in the selective formation of these
Substituted Aralkyl Aldehydes: Preparation and Antitumor Evaluation
作者:John H. Billman、John A. Tonnis
DOI:10.1002/jps.2600600815
日期:1971.8
hydrocinnamaldehydes, and cinnamaldehydes—was prepared and tested for antitumor activity. The substituted phenylacetaldehydes were prepared from the corresponding benzaldehydes via the Darzenglycidicestersynthesis, followed by hydrolysis and decarboxylation. The dihydrocinnamaldehydes were prepared by the lead tetraacetate oxidation of the corresponding alcohols. The cinnamaldehydes were prepared
.alpha.,.omega.-Diarylpolyene photosensitizers for sulfonylazide polymers
申请人:The Upjohn Company
公开号:US03947337A1
公开(公告)日:1976-03-30
A novel class of compounds is disclosed of the formula ##SPC1## Wherein R.sub.1 and R.sub.2 are lower-alkoxy or di(lower-alkyl)amino and R.sub.1 can be hydrogen and R.sub.3 and R.sub.4 are hydrogen, lower-alkoxy or di(lower-alkyl)amino and n is an integer from 1 to 5. The compounds are sensitizers for photosensitive compounds particularly polymers containing sulfonazido groups as the light-sensitive moiety.
A metal-free one-pot cascade synthesis of highly functionalized biaryl-2-carbaldehydes
作者:Chandrasekhar Challa、Jamsheena Vellekkatt、Jaice Ravindran、Ravi S. Lankalapalli
DOI:10.1039/c4ob01829j
日期:——
A metal-free one-pot cascade annulation of acyclic substrates dienaminodioate, cinnamaldehydes and allyl amine was achieved for the synthesis of polyfunctional biaryl-2-carbaldehydes. The reaction proceeds at room temperature by a trifluoroacetic acid mediated Diels–Alder pathway. Synthetic applications of the resulting biaryl-2-carbaldehyde have been demonstrated by conversion into an array of diverse