Chemoselective Aromatic C–H Insertion of α-Diazo-β-ketoesters Catalyzed by Dirhodium(II) Carboxylates
摘要:
The ability of alpha-diazo-beta-ketoesters bearing a substituent on the benzylic position to undergo aromatic C-H insertion is described. Good to excellent yields of the aromatic C-H insertion products were observed with Rh-2(tpa)(4) or Rh-2(esp)(2) catalysts. This is an attractive strategy to prepare tetralins carrying a methyl group on the benzylic position, a structural motif found in several types of natural products.
研发了向γ,δ-不饱和β-二羰基化合物中的第一个催化不对称共轭加成物。用手性二烯-铑(I)μ-氯二聚体作为甲苯/ H 2 O的催化剂,γ,δ-不饱和β-二羰基化合物与芳基硼酸的不对称共轭芳基化反应高效进行,具有出色的对映选择性。生成的β-二羰基产物是通用的手性合成子,可以容易地转化为多种重要的手性结构。