Department of Chemistry, University of Delhi, Delhi-110 007 7-Hydroxy-4-propy1-2H-1-benzopyran-2-one (1) on allylation followed by Claisen migration of the intermediate allyloxycoumarin 2 with N,N-dimethylaniline gives 8-allyl- and 6-allyl-7-hydroxy-4-propyl-2H-1-benzopyran-2-ones (3 and 4) which on oxidation with OsO4 — KIO4 and subsequent cyclodehydration with PPA yield 7-propyl- 5 H-furo[2,3-b][1] benzopyran-5-one (7) and 5-propyl-7H-furo[3,2-g][1] benzopyran-7-one (10), respectively. However, these ally! coumarins 3 and 4 on cyclisation with sulphuric acid followed by dehydrogenation with DDQ afford 2-methyl-7-propyl-5 H-furo[2,3-H] [1]benzopyran-5-one (9) and 2-methyl-5-propy1-7H-furof3,2-allbenzopyran-7-one (12) respectively. Simila...
Chemistry Department, Faculty of Science, M. S. University of Baroda, Baroda-390 002 Manuscript rec...
4-Hydroxycoumarin has been condensed with malic acid to yield benzopyranyl (3, 2-c) pyres-2,8-dione ...
858-862Starling from natural coumarin, scopoletin, the syntheses of 8-methyl-6-methoxy l-2H-furo(2 ...
Department of Chemitry, University of Delhi, Delhi-110-007 7-Hydhoxy-4-propyl-2H-l-benzopyran-2-one...
Claisen rearrangement of 4-methoxy-7-allyloxy-8-methylcomnarin prepared from 2-hydroxy-3 -methyl-4-a...
Chemistry Department, Faculty of Science, M.S. University of Baroda, Baroda Manuscript received 10 ...
Chemistry Department, Faculty of Science, M. S. University of Baroda, Baroda.2 Manuscript received ...
Claisen rearrangement of 7-allyloxy-4-phenyl-8-methylcoumarin gave 7-hydroxy-6-allyl-4-phenyl-8-meth...
Chemistry Department, Faculty of Science, M. S. University of Baroda, Baroda 390 002 Manuscript rec...
4-Allyloxycoumarin derivatives (II), when subjected to Claisen rearrangement gave 2-methyl-2,3- dihy...
7-Hydroxy-8-acetylcoumarin on bromination and hydrolysis gave 6-hydroxy-7-acetylbenzofuran, which on...
Chemistry Department, Faculty of Science, M. S. University of Baroda, Baroda-2 Manuscript received ...
Chemistry Department, Faculty of Science, M. S. University of Baroda, Baroda-2 (Manuscript receiv...
The product obtained by the reaction of angelicin (II) with aluminium chloride in benzene has been f...
7-Aeyloxy-4-alkyl or aryl-8-methylcoumarin on Fries migration, afforded 7-hydroxy-6-acy1-4.alkyl or ...
Chemistry Department, Faculty of Science, M. S. University of Baroda, Baroda-390 002 Manuscript rec...
4-Hydroxycoumarin has been condensed with malic acid to yield benzopyranyl (3, 2-c) pyres-2,8-dione ...
858-862Starling from natural coumarin, scopoletin, the syntheses of 8-methyl-6-methoxy l-2H-furo(2 ...
Department of Chemitry, University of Delhi, Delhi-110-007 7-Hydhoxy-4-propyl-2H-l-benzopyran-2-one...
Claisen rearrangement of 4-methoxy-7-allyloxy-8-methylcomnarin prepared from 2-hydroxy-3 -methyl-4-a...
Chemistry Department, Faculty of Science, M.S. University of Baroda, Baroda Manuscript received 10 ...
Chemistry Department, Faculty of Science, M. S. University of Baroda, Baroda.2 Manuscript received ...
Claisen rearrangement of 7-allyloxy-4-phenyl-8-methylcoumarin gave 7-hydroxy-6-allyl-4-phenyl-8-meth...
Chemistry Department, Faculty of Science, M. S. University of Baroda, Baroda 390 002 Manuscript rec...
4-Allyloxycoumarin derivatives (II), when subjected to Claisen rearrangement gave 2-methyl-2,3- dihy...
7-Hydroxy-8-acetylcoumarin on bromination and hydrolysis gave 6-hydroxy-7-acetylbenzofuran, which on...
Chemistry Department, Faculty of Science, M. S. University of Baroda, Baroda-2 Manuscript received ...
Chemistry Department, Faculty of Science, M. S. University of Baroda, Baroda-2 (Manuscript receiv...
The product obtained by the reaction of angelicin (II) with aluminium chloride in benzene has been f...
7-Aeyloxy-4-alkyl or aryl-8-methylcoumarin on Fries migration, afforded 7-hydroxy-6-acy1-4.alkyl or ...
Chemistry Department, Faculty of Science, M. S. University of Baroda, Baroda-390 002 Manuscript rec...
4-Hydroxycoumarin has been condensed with malic acid to yield benzopyranyl (3, 2-c) pyres-2,8-dione ...
858-862Starling from natural coumarin, scopoletin, the syntheses of 8-methyl-6-methoxy l-2H-furo(2 ...