Table 1.
IUPAC names and chemical structures of the synthesized compounds.
| serial number | sample code | name | structure |
|---|---|---|---|
| 1 | SP-1 | 1′,3'-dihydro-3′,3'-dimethyl-1'-ethyl-7-nitro-spiro(2H-1-benzopyran-2,2'-(2H)-indole) |  |
| 2 | SP-2 | 1′,3'-dihydro-3′,3'-dimethyl-1'-propyl-7-nitro-spiro(2H-1-benzopyran-2,2'-(2H)-indole) |  |
| 3 | SP-3 | 1′,3'-dihydro-3′,3'-dimethyl-1'-butyl-7-nitro-spiro(2H-1-benzopyran-2,2'-(2H)-indole) |  |
| 4 | SP-4 | 1′,3'-dihydro-1'-(1-methylpropyl)-3′,3'-dimethyl-7-nitro-spiro(2H-1-benzopyran-2,2'-(2H)-indole) |  |
| 5 | SP-5 | 1′,3'-dihydro-1'-(1-methylacetate)-3′,3'-dimethyl-7-nitro-spiro(2H-1-benzopyran-2,2'-(2H)-indole) |  |
| 6 | SP-6 | 1′,3'-dihydro-1'-(1-ethylacetate)-3′,3'-dimethyl-7-nitro-spiro(2H-1-benzopyran-2,2'-(2H)-indole) |  |
| 7 | SP-7 | 1′,3'-dihydro-3′,3'-dimethyl-1'-ethyl-6-nitro-spiro(2H-1-benzopyran-2,2'-(2H)-indole) |  |
| 8 | SP-8 | 1′,3'-dihydro-3′,3'-dimethyl-1'-propyl-6-nitro-spiro(2H-1-benzopyran-2,2'-(2H)-indole) |  |
| 9 | SP-9 | 1′,3'-dihydro-3′,3'-dimethyl-1'-butyl-6-nitro-spiro(2H-1-benzopyran-2,2'-(2H)-indole) |  |
| 10 | SP-10 | 1′,3'-dihydro-1'-(1-methylpropyl)-3′,3'-dimethyl-6-nitro-spiro(2H-1-benzopyran-2,2'-(2H)-indole) |  |
| 11 | SP-11 | 1′,3'-dihydro-1'-(1-methylacetate)-3′,3'-dimethyl-6-nitro-spiro(2H-1-benzopyran-2,2'-(2H)-indole) |  |
| 12 | SP-12 | 1′,3'-dihydro-1'-(1-ethylacetate)-3′,3'-dimethyl-6-nitro-spiro(2H-1-benzopyran-2,2'-(2H)-indole) |  |