Hypervalent Iodine(V)-Induced Asymmetric Oxidation of Sulfides to Sulfoxides Mediated by Reversed Micelles: Novel Nonmetallic Catalytic System
作者:Hirofumi Tohma、Shinobu Takizawa、Hiroaki Watanabe、Yuko Fukuoka、Tomohiro Maegawa、Yasuyuki Kita
DOI:10.1021/jo982295t
日期:1999.5.1
chiral hypervalent iodine reagents have been used for asymmetric induction, all of them have needed more than a stoichiometric amount of chiral reagents and have shown low enantioselectivities. The described new catalytic asymmetric oxidation using a hypervalent iodine(V) reagent, iodoxybenzene (PhIO(2)), in a cationic reversed micellar system provides the first example of a catalytic asymmetric oxidation
尽管几种类型的手性高价碘试剂已经用于不对称诱导,但是它们全部都需要超过化学计量的手性试剂,并且显示出低的对映选择性。所描述的在阳离子反向胶束系统中使用高价碘(V)试剂碘代氧苯(PhIO(2))的新催化不对称氧化提供了硫化物催化不对称氧化成亚砜的高化学收率且中等至良好的第一个例子。不使用任何过渡金属催化剂的对映选择性。通过添加催化量的十六烷基三甲基溴化铵(CTAB)和手性酒石酸衍生物,增溶和活化PhIO(2)被发现对于提高化学和光学收率是必不可少的。