Synthese De Quelques Spiro[Indoline‐Naphtoxazines] Et Spiro[Indoline‐Pyridobenzoxazines] Photochromiques. Application De La Methodologie De La Recherche Experimentale

Abstract Some spiro[indoline‐naphthoxazines] I and spiro[indoline‐pyridobenzoxazines] II substituted by different groups were synthesized in order to evaluate their photochromic properties 1 and to optimize the preparation of spiroheterocyclic systems. In addition, some spiro[indoline‐naphthopyrans] III were also prepared as reference compounds. Their physical and spectroscopic characteristics (UV, 1 H and 13 C NMR) were determined. A study using the experimental design methodology allowed to point out the most important factors for improving the reaction yields.