A Practical and Cost-Effective Synthesis of d-erythro-Sphingosine from d-ribo-Phytosphingosine via a Cyclic Sulfate Intermediate - Lee, Yun Mi; Lee, Seokwoo; Jeon, Hongjun; Baek, Dong Jae; Seo, Jae Hong; Kim, Deukjoon; Kim, Sanghee (Synthesis, 2011)