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
Ross A Arthurs;C. Richards
中科院分区:
化学1区
文献类型:
--
作者:
Ross A Arthurs;C. Richards

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(S)-2-二茂铁基-4-(取代的)恶唑啉的高度非对映选择性锂化(s-BuLi/TMEDA在Et 2 O中,-78 ℃,2 h),随后加入MeOH-d4,得到高达95%的D掺入。随后应用替代的锂化条件(n-BuLi在THF中,-78 °C,2小时),然后加入亲电试剂,导致主要由锂化的高kH/kD值控制的非对映选择性的逆转(异构体比率通常在10:1和20:1之间)。
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).