Benzo-Fused 1,4-Heterocycles via Dialkyl Carbonate Chemistry

Abstract

A novel halogen-free synthesis of benzo-fused six-membered 1,4-heterocycles through the chemistry of dialkyl carbonates is reported. Commercially available catechol, 2-aminophenol, and 2-amino­thiophenol were reacted first with ethylene carbonate in an autoclave to give O-hydroxyethyl, N-hydroxyethyl, and S-hydroxyethyl derivatives respectively, through a B_Al2 mechanism. Then 2-(2-hydroxyethoxy)phenol and 2-(2-hydroxyethylamino)phenol were cyclized in excellent yields by reaction with dimethyl carbonate (DMC) and DABCO as a bi­cyclic organic base to give the corresponding benzodioxine and benzoxazine derivative, respectively. Moreover, 2-(2-aminophenylthio)ethanol afforded the benzothiazine derivative in good yield by reaction with DMC with an excess of a strong base such as NaH. The investigation on the cyclization reaction has highlighted that several equilibria are involved leading to the formation of carbonate and carbamate intermediates through B_Ac2 mechanisms. Depending on the reaction conditions employed, these intermediates may undergo either kinetic-controlled ring closure by a B_Al2 mechanism or by-product formation.

Key words

heteroycles - cyclization reaction - green chemistry - alkylation - chemoselectivity

• References

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