BENZOPYRANS .29. REACTIONS OF SOME SIMPLE CONDENSATES OF 4-OXO-4H-1-BENZOPYRAN-3-CARBOXALDEHYDE WITH NITROGEN NUCLEOPHILES

Authors
GHOSH CK SAHANA S BANDYOPADHYAY C
Citation
Ck. Ghosh et al., BENZOPYRANS .29. REACTIONS OF SOME SIMPLE CONDENSATES OF 4-OXO-4H-1-BENZOPYRAN-3-CARBOXALDEHYDE WITH NITROGEN NUCLEOPHILES, Indian journal of chemistry. Sect. B: organic chemistry, including medical chemistry, 32(6), 1993, pp. 624-629
Citations number
8
Categorie Soggetti
Chemistry Inorganic & Nuclear
Journal title
Indian journal of chemistry. Sect. B: organic chemistry, including medical chemistry → ACNP
ISSN journal
03764699
Volume
32
Issue
6
Year of publication
1993
Pages
624 - 629
Database
ISI
SICI code
0376-4699(1993)32:6<624:B.ROSS>2.0.ZU;2-C
Abstract
The chromone 2, derived from the title aldehyde 1, gives the pyrazole 8 (R3 = Ph) with phenylhydrazine whereas 5 gives with H2NNHR3 (R3 = H and Ph) the pyridine derivatives (9). Hydroxylamine converts the chrom ones 24 into pyridine-1-oxides (13-15), respectively. The reaction of 1 with ethyl glycinate in the presence of pyridine affords the pyrrole s 20 and 21, the former (20) being detected in the product mixture der ived from 4 and ethyl glycinate.