1,3,2-Oxazaphospholidine compound, preparation method and application

The invention discloses 1,3,2-oxazaphospholidine compound shown as in following formula I, a preparation method and application. The 1,3,2-oxazaphospholidine compound is simple to prepare, low in cost, high in productivity, suitable for industrial production, capable of activating natural cytotoxic T-cells and applicable to treating cancers, infections and autoimmune diseases, such as systemic lupus erythematosus and scleroderma.