A flexible approach to construct three contiguous chiral centers of sphingolipids, and asymmetric synthesis of d-ribo-phytosphingosine and its derivatives
作者:Cholmen Xarnod (Lu-Men Chao)、Wei Huang、Rong-Guo Ren、Ru-Cheng Liu、Bang-Guo Wei
DOI:10.1016/j.tet.2012.05.120
日期:2012.8
An efficient approach to build the three contiguous stereogenic centers of sphingosine unit starting from cheap glutamic acid is described. The key step of this approach is the SmI2-mediated cross-coupling of chiral N-tert-butanesulfinyl imine 11 with sterically hindered aliphatic aldehyde 9 or 21 to construct hydroxymethyl beta-amino alcohol 10 or 22 in high diastereoselectivity (>99%, de). The utility of this flexible method has been demonstrated in the synthesis of D-ribo-phytosphingosine 1, its two derivatives 18 and 29. Moreover, a practicable synthetic route for synthesis of various sphingolipids, ceramides, alpha-galactosylceramides and their derivatives is also described. (c) 2012 Elsevier Ltd. All rights reserved.