Lee, Hyunji; Lee, You-Kyoung; Kim, Dong-Guk; Son, Mi-Sun; Nam, Tae-Gyu; Jeong, Byeong-Seon Tetrahedron Letters, 2014, vol. 55, # 43 p. 5895 - 5897 doi: 10.1016/j.tetlet.2014.08.085