Deuterium as a Stereochemically Invisible Blocking Group for Chiral Ligand Synthesis.
Deuterium as a Stereochemically Invisible Blocking Group for Chiral Ligand Synthesis.
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DOI:
10.1021/acs.orglett.6b03874
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发表时间:
2017-01
期刊:
影响因子:
5.2
通讯作者:
Ross A Arthurs;C. Richards
中科院分区:
文献类型:
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作者:
Ross A Arthurs;C. Richards
Highly diastereoselective lithiation (s-BuLi/TMEDA in Et2O, -78 °C, 2 h) of (S)-2-ferrocenyl-4-(substituted)oxazolines followed by addition of MeOH-d4 gave up to 95% D incorporation. Subsequent application of alternative lithiation conditions (n-BuLi in THF, -78 °C, 2 h), followed by addition of an electrophile, resulted in a reversal of diastereoselectivity controlled primarily by the high kH/kD value for lithiation (isomer ratio typically between 10:1 and 20:1).