Synthesis and evaluation of new chiral diols based on the dicyclopentadiene skeleton
作者:Giuseppe Borsato、Ottorino De Lucchi、Fabrizio Fabris、Vittorio Lucchini、Pietrogiulio Frascella、Alfonso Zambon
DOI:10.1016/s0040-4039(03)00664-6
日期:2003.4
rac-5 (from reduction of ketone 6, obtained from dicyclopentadiene with a new environment-friendly synthesis) gives (2S)-5, which was further reduced to the endo(2R)-1a alcohol. The endo(2S)-1b alcohol was obtained from camphor with a multistep synthesis. Pinacol couplings of 3a,b, carried out with Mg/Hg or Corey's general procedure respectively, afforded with high diastereoselectivity the C2 symmetry
脂肪酶PS对rac - 5的拆分(由二环戊二烯的酮6还原,通过新的环境友好合成法制得)得到(2 S)-5,进一步还原为内含(2 R)-1a醇。的内切(2小号- )1B是从樟脑用多步合成得到的醇。分别用Mg / Hg或Corey's通用方法进行的3a,b的Pinacol偶联可提供非对映选择性高的C 2对称二醇(2 R,2'R)-2a和(2 S,2 'S)-2b具有面向内的OH功能。所述的enantiogenic功率内醇(2 - [R - )1A和(2小号) - 1B和二醇的(2 - [R,2' - [R )-图2a和(2小号,2'小号) -图2b是向着的LiAlH测试4还原苯乙酮。在c ^ 2对称性似乎发挥基础性作用。