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Tahir, R., Banert, K., Solhy, S. and Sebti, S. (2006) Zinc Bromide Supported on Hydroxyapatite as a New and Efficient Solid Catalyst for Michael Addition of Indoles to Electron-Deficient Olefins. Journal of Molecular Catalysis A, 246, 39-42.
https://www.sciencedirect.com/science/article/pii/S1381116905007259
https://doi.org/10.1016/j.molcata.2005.10.012

has been cited by the following article:

• TITLE: A Mild and Efficient Method for the Synthesis of Acylals from Aromatic Aldehydes and Their Deprotections Catalyzed by Synthetic Phosphates under Solvent-Free Conditions

  AUTHORS: Fathallaah Bazi, Bahija Mounir, Mohammed Hamza, Said Sebti

  KEYWORDS: Synthetic Phosphates, Clean Process, Acylals, Protection, Deprotection

  JOURNAL NAME: Green and Sustainable Chemistry, Vol.8 No.4, November 30, 2018

  ABSTRACT: An efficient and clean preparation of acylals from aromatic aldehydes in the presence of synthetic phosphates (flourapatite and hydroxyapatite doped with ZnCl2 and ZnBr2) and acetic anhydride was achieved easily in high yields (86% - 97%) at room temperature under solvent-free conditions. Deprotection of the resulting acylals has also been attained by using the same catalysts under microwave irradiation. This method consistently has advantage of excellent yields (82% - 96%) and a short reaction time (3 - 4 min).