Synthesis of Indoles from o,β-Dinitrostyrenes via Indium/Acetic Acid-Mediated Reductive Heterocyclizations
摘要:
Reductive heterocyclization reactions of various 1-nitro-2-(2-nitroaryl)ethenes to indoles were investigated. In the presence of indium/AcOH in toluene or benzene, 1-nitro-2-(2-nitroaryl)ethenes were cyclized to give corresponding indoles in good yields.
Highly enantio- and diastereoselective Michael addition of cyclohexanone to nitroolefins catalyzed by a chiral glucose-based bifunctional secondary amine-thiourea catalyst
A novel bifunctional thiourea bearing a saccharide-scaffold and a secondary amino group was synthesized, and was proven to be an effective organocatalyst for the asymmetric Michael reaction of cyclohexanone to both aryl and alkyl nitroolefins. The corresponding adducts were obtained with excellent diastereo- (up to >99/1 dr) and enantioselectivities (up to 97% ee).
<scp>β‐Nitrostyrenes</scp>
as a valuable precursor for the synthesis of β‐aryl‐γ‐lactam and 2‐oxo‐1,2‐dihydroquinoline derivatives
作者:Dandamudi V. Lenin、Disha Patel、Payal Malvi
DOI:10.1002/jhet.4446
日期:2022.3
2-dihydroquinoline derivatives using β-nitrostyrenes. The reaction strategy involves the Michaeladdition followed by reduction and cyclization reactions. Michael adducts containing two different nitro group such as one on aryl ring and another on side chain, selectively takes the path to involve nitro group on aryl to form 2-oxo-1,2-dihydroquinoline derivatives as cyclized product. Michael adducts with
Organocatalytic asymmetric intramolecular aza-Henry reaction: facile synthesis of trans-2,3-disubstituted tetrahydroquinolines
作者:Rajendra Maity、Subhas Chandra Pan
DOI:10.1039/c5ob00795j
日期:——
An enantio- and diastereoselective organocatalytic intramolecular aza-Henry (nitro-Mannich) reaction has been developed. The trans-2-aryl-3-nitro-tetrahydroquinoline products are obtained in high yields and in good enantioselectivities with a bifunctional tertiary amine-thiourea catalyst. Excellent enantioselectivities were obtained after single recrystallization of some products.