Abstract
AbstractThis study reports on the isothiouronium salt catalyzed transfer hydrogenation of various 3‐substituted‐2H‐1,4‐benzoxazines, with Hantzsch esters as a hydrogen source. Transfer hydrogenation of 1,4‐benzoxazines has been successfully carried out with small amount of 1 mol% S‐benzyl‐N,N′‐diphenyl isothiouronium iodide as a catalyst. Various 3,4‐dihydro‐2H‐1,4‐benzoxazines were obtained in quantitative yield at room temperature.
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