Rhodium-Catalyzed Asymmetric 1,4-Addition of Arylboronic Acids to Coumarins: Asymmetric Synthesis of (<i>R</i>)-Tolterodine
作者:Gang Chen、Norihito Tokunaga、Tamio Hayashi
DOI:10.1021/ol0507367
日期:2005.5.1
[reaction: see text]. Rhodium-catalyzed asymmetric 1,4-addition of arylboronic acids to coumarins proceeded with high enantioselectivity in the presence of a rhodium catalyst (3 mol %) generated from Rh(acac)(C2H4)2 and (R)-Segphos to give the corresponding (R)-4-arylchroman-2-ones in over 99% ee. This asymmetric reaction was applied to the synthesis of (R)-tolterodine.
[反应:请参见文字]。在由Rh(acac)(C2H4)2和(R)-Segphos生成的铑催化剂(3 mol%)的存在下,铑催化的芳基硼酸向香豆素的不对称1,4-加成反应以高对映选择性进行。超过99%ee的(R)-4-芳基苯并吡喃-2-酮 该不对称反应用于(R)-托特罗定的合成。