Enantioselective 1,3-Dipolar Cycloaddition of Methyleneindolinones with α-Diazomethylphosphonate to Access Chiral Spiro-phosphonylpyrazoline-oxindoles Catalyzed by Tertiary Amine Thiourea and 1,5-Diazabicyclo[4.3.0]non-5-ene
作者:Nan Huang、Liangliang Zou、Yungui Peng
DOI:10.1021/acs.orglett.7b02763
日期:2017.11.3
A methodology to access chiral 3,3′-spiro-phosphonylpyrazoline oxindoles via an asymmetric 1,3-dipolar cycloaddition reaction of substituted methyleneindolinones with α-diazomethylphosphonate in the catalysis of tertiary amine thiourea and 1,5-diazabicyclo[4.3.0]non-5-ene (DBN) has been established. This method exhibits high functional group compatibility, where a wide range of methyleneindolinones
在叔胺硫脲和1,5-二氮杂双环[4.3.0] non催化下,通过取代的亚甲基吲哚满酮与α-重氮甲基膦酸酯的不对称1,3-偶极环加成反应获得手性3,3'-螺代膦酰基吡唑啉恶唑的方法-5-ene(DBN)已建立。该方法显示出高的官能团相容性,其中该反应可容纳各种具有各种取代基和杂环的亚甲基吲哚满酮。可以通过环收缩将所得的手性3,3'-螺-膦酰基吡唑啉恶唑进一步转化为螺-膦酰基环丙烷恶唑。