Asymmetric hydroboration of [ E ]- and [ Z ]-2-methoxy-2-butenes. Synthesis of (−)-[2 R ,3 R ]-butane-2,3-diol in >97% ee
作者:Dhanabalan Murali、Bakthan Singaram、Herbert C. Brown
DOI:10.1016/s0957-4166(00)00485-7
日期:2000.12
Asymmetric hydroboration of [E]- and [Z]-2-methoxy-2-butene, using (-)-diisopinocampheylborane at -25 degreesC in THF solvent, followed by oxidation using H2O2/NaOH, gave (-)-[2R,3R]- and (+)-[2R,3S]-3-methoxy-2-butanols in >97 and 90% ee, respectively. (-)-[2R,3R]-3-Methoxy-2-butanol was converted to (-)-[2R,3R]-butane-2,3-diol (>97% ee, in an overall yield of 65%). (C) 2001 Elsevier Science Ltd. All rights reserved.