A　facile　one-pot　synthesis　of　tricyclo-1,4-benzoxazines　has　been　developed　via　metal-free　intramolecular　cyclization　of　indole　derivates.　These　reactions　were　efficiently　achieved　at　ambient　temperature　by　using　visible-light　photoredox　catalysis　in　continuous　flow.　This　directed　intramolecular　cyclization　could　be　easily　handled　and　scaled　up　in　an　open　flask,　enabling　construction　of　a　focused　compound　library　for　further　pharmacological　evaluation.　(C)　2017　Elsevier　Ltd.　All　rights　reserved.