Copper‐Catalyzed Asymmetric 1,4‐Hydroboration of Coumarins with Pinacolborane: Asymmetric Synthesis of Dihydrocoumarins
作者:Hyohyun Kim、Jaesook Yun
DOI:10.1002/adsc.201000310
日期:2010.10.9
An efficient asymmetric addition of pinacolborane to 4-substituted coumarins proceeded with high enantioselectivity in the presence of a copper(I)-QuinoxP complex as a catalyst to produce the corresponding 1,4-hydroboration products. Treatment of the intermediates with electrophiles, without isolation, resulted in enantioenriched dihydrocoumarins. The utility of this protocol was demonstrated in the
在铜(I)-QuinoxP络合物作为催化剂的存在下,将频哪醇硼烷有效地不对称添加到4-取代的香豆素中,并具有高对映选择性,以生产相应的1,4-氢硼化产物。不经分离用亲电子试剂处理中间体,得到对映体富集的二氢香豆素。在生物活性分子的正式合成中证明了该方案的实用性。