Constructing spirooxindoles from non-oxindole precursors: a one-pot nitro-reduction/double lactamization approach to spiro[indoline-3,3'-quinoline]-2,2'-diones.
Org Biomol Chem
; 22(37): 7601-7606, 2024 Sep 25.
Article
in En
| MEDLINE
| ID: mdl-39225015
ABSTRACT
2-(2-Nitrobenzyl)-2-(2-nitrophenyl)malonates, readily prepared by SNAr-arylation of diethyl malonate with o-fluoronitrobenzenes, followed by SN2-alkylatioin of the resulting products with o-nitrobenzyl bromides, undergo a tandem Fe/AcOH-promoted nitro-reduction and double lactamization sequence to afford spiro[indoline-3,3'-quinoline]-2,2'-diones in high overall yields. The method is operationally simple, economical, and has a broad substrate scope. The synthetic practicality of this methodology was illustrated by performing the reaction on a gram scale with the same efficiency.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
Org Biomol Chem
/
Org. biomol. chem
/
Organic & biomolecular chemistry
Journal subject:
BIOQUIMICA
/
QUIMICA
Year:
2024
Document type:
Article
Country of publication:
United kingdom