Catalytic Asymmetric Synthesis of the <i>endo</i>-6-Aryl-8-oxabicyclo[3.2.1]oct-3-en-2-one Natural Product from <i>Ligusticum chuanxing</i> via 1,3-Dipolar Cycloaddition of a Formyl-Derived Carbonyl Ylide Using Rh<sub>2</sub>(<i>S</i>-TCPTTL)<sub>4</sub>
作者:Naoyuki Shimada、Taiki Hanari、Yasunobu Kurosaki、Koji Takeda、Masahiro Anada、Hisanori Nambu、Motoo Shiro、Shunichi Hashimoto
DOI:10.1021/jo101175b
日期:2010.9.3
The reaction of a six-membered cyclic formyl-carbonyl ylide derived from α-diazo-β-ketoester with phenylacetylene derivatives under the catalysis of dirhodium(II) tetrakis[N-tetrachlorophthaloyl-(S)-tert-leucinate], Rh2(S-TCPTTL)4, provides cycloadducts containing an 8-oxabicyclo[3.2.1]octane ring system in up to 97% ee. This represents the first example of an enantioselective 1,3-dipolar cycloaddition
六元环状甲酰基羰基叶立德的反应从α重氮基β酮酯与苯乙炔衍生物的二铑的催化下(II)四[ Ñ -tetrachlorophthaloyl-(小号) -叔-leucinate]的Rh 2(S- TCPTTL)4,提供包含高达97%ee的8-氧杂双环[3.2.1]辛烷环系统的环加合物。这代表了环状甲酰基-羰基内酯的对映选择性1,3-偶极环加成的第一个例子。使用该催化过程中,不对称合成内切-6-芳基-8-氧杂双环[3.2.1]辛-3-烯-2-酮的天然产物1从藁传兴园艺。已经实现。