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An efficient and sustainable synthesis of 2,3-dihydro-2-phenyl- 1H -naphtho[1,2-e] [1,3]Oxazine and 3,4-dihydro-3-phenyl- 2H -naphtho[2,1-e][1,3]oxazine derivatives has been achieved by the one-pot, multicomponent condensation of α- or β-naphthol (1 mmol), an aniline (1 mmol) and formaldehyde (2 mmol) using aq. 30% NaPTS hydrotropic solution at room temperature. The aqueous hydrotropic medium is nontoxic, reusable, inexpensive, and easily available. This improved strategy allows the very comfortable preparation of a wide variety of substituted [1,3]Oxazine derivatives under mild reaction conditions with a maximum yield of up to 92%, easy isolation of purified compounds, and an eco-friendly approach under sustainable development. This organic transformation shows a clean and green protocol for the synthesis of 2,3-dihydro-2-phenyl- 1H -naphtho[1,2-e] [1,3]oxazine and 3,4-dihydro-3-phenyl- 2H -naphtho[2,1-e][1,3]oxazine derivatives.

Clean and Green Approach for Synthesis of Various Derivatives of [1,3]Oxazine in Sustainable Aqueous Hydrotropic Medium