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HuagongsheHuagongshe Chemistry Print Report · For research reference only
HRID 991809Generated: October 30, 2026

2-Oxindole-5-carboxylic acid → 2-Oxo-3-(4-oxo-2,4,6,7-tetrahydro-pyrano[3,4-c]pyrrol-1-ylmethylene)-2,3-dihydro-1H-indole-5-carboxylic acid

https://huagongshe.com/reaction/991809

Reaction equation

Participants

RoleNameHCIDCharge
Reactant2-Oxindole-5-carboxylic acidHCID 2773318—
Reactant4-Oxo-2,4,6,7-tetrahydropyrano[3,4-C]pyrrole-1-carbaldehydeHCID 9834049—
Product2-Oxo-3-(4-oxo-2,4,6,7-tetrahydro-pyrano[3,4-c]pyrrol-1-ylmethylene)-2,3-dihydro-1H-indole-5-carboxylic acidHCID 69707137—

Reaction Steps

2-Oxo-2,3-dihydro-1H-indole-5-carboxylic acid was condensed with 4-oxo-2,4,6,7-tetrahydro-pyrano[3,4-c]pyrrole-1-carbaldehyde to give the title compound.

Provenance & Evidence

DOI10.6084/m9.figshare.5104873.v1
Patent numberUS06465507B2
Source datasetuspto-grants-2002_10
ORD IDord-f7e0ce73781c48b1bce085ee0840e00a
Source noteuspto-grants-2002_10