1: 52 percent / 1,3-dimethyl-2-phenyl-1,3,2-diazaphospholidine / tetrahydrofuran / 24 h 2: 80 percent / 1 M tetra-n-butylammonium fluoride / tetrahydrofuran View Scheme

With  1,3-dimethyl-2-phenyl-1,3,2-diazaphospholidine in  tetrahydrofuran 24 h;