Add time:08/20/2019         Source:sciencedirect.com

Two new and efficient synthetic routes towards substituted 4H-1,4-benzoxazine derivatives were reported. The first one involves the synthesis in four steps of the 4-Boc-4H-1,4-benzoxazine and its regioselective substitution on C-3 following a lithiation–electrophilic substitution sequence. The second route involves palladium-catalyzed coupling reactions between organostannanes and a vinylphosphate obtained from a benzoxazin-3-one derivative.

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