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- W2025772766 abstract "Starting with the same two components, aldehydes and ureas/thioureas, two comparative methods for the construction of thiazines, oxazines and hexahydropyrano[2,3-d]pyrimidines are reported. In one sequence, the third component, an alkene, completes a [4+2] cycloaddition approach while in the other path dihydropyran is added to effect a Biginelli-type reaction. Both sequences require TMSCl and proceed in good yields and high overall diastereoselectivity. The formation of thiazines and oxazines is proposed to proceed via initial generation of an N-acyliminium species, which undergoes Diels-Alder reaction with the added alkene." @default.
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- W2025772766 date "2006-09-01" @default.
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- W2025772766 title "Diastereoselective Routes to Thiazines, Oxazines and Pyranopyrimidines" @default.
- W2025772766 doi "https://doi.org/10.1055/s-2006-949353" @default.
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