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. 2023 Mar 10;17(1):12. doi: 10.1186/s13065-023-00930-5

Table 2.

Synthesis of spiro-indoline-pyranochromene derivativesa

Entry Products Chemical formula M.P. (°C) Yields (%)
4a graphic file with name 13065_2023_930_Figb_HTML.gif C20H11N3O4 290–293 (27) 95
4b graphic file with name 13065_2023_930_Figc_HTML.gif C25H22N2O6 208–212(19) 88
4c graphic file with name 13065_2023_930_Figd_HTML.gif C26H22N2O6 224–227(19) 88
4d graphic file with name 13065_2023_930_Fige_HTML.gif C26H22N2O6 257–258(19) 92
4e graphic file with name 13065_2023_930_Figf_HTML.gif C28H20N2O6 280–281(19) 93
4f graphic file with name 13065_2023_930_Figg_HTML.gif C26H24N2O6

218–220

(19)

87
4 g graphic file with name 13065_2023_930_Figh_HTML.gif C27H24N2O6 228–230 (19) 87
4 h graphic file with name 13065_2023_930_Figi_HTML.gif C29H22N2O6 233–235 (19) 90

aReaction conditions: 1.0 mmol of isatin ring, nitrile moiety, 4-hydroxy coumarin and 0.04 g catalyst under solvent-free at r.t