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In this review we focus on applications of alkyl orthoesters as valuable and efficient substrates to perform various classes of two-component and multi-component organic reactions.

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Nano-size MgBi 2 O 4 has been synthesized for the first time via a simple co-precipitation method using the surfactant N-cetyl-N, N, N-trimethylammonium bromide (CTAB). Fourier transform infrared (FT-IR), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and X-ray powder diffraction (XRD) techniques were employed to characterize the nano-catalyst. Additionally, the reactivity of the prepared nanoparticles was investigated in the synthesis of 1-aryl-2-(2-oxoindolin-3-yl)spiro[indoline-3,5-pyrroline]-2,3-diones in a one-pot, one-step and pseudo four-component condensation of arylamine, acetone, and isatins at 50 • C in water. Five new compounds were synthesized and identified. This procedure has various advantages such as, short reaction times, mild eco-friendly conditions and excellent yields to prepare a novel class of heteroaromatic compounds. MgBi 2 O 4 possess superior qualities such as easy and economic preparation procedure and handling, stability, and non-toxicity. Its reusability has also been examined upto 4 runs without activity loss. Keywords. MgBi 2 O 4 ; spiro compound; multi-component reactions; green chemistry.

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