Abstract
Reported is a base-promoted tandem ring opening of N-substituted aziridines with propargylic alcohols followed by ring closing onto the tethered alkyne to give dihydroxazines in moderate to good yields. Selected examples of dihydroxazines were further reduced to 3,5-disubstituted morpholine derivatives with poor to high (where cis isomer predominates) diastereoselectivity.
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