Asymmetric Hydroformylation of Vinylfurans Catalyzed by {(11bS)-4-{[(1R)-2′-Phosphino[1,1′-binaphthalen]-2-yl]oxy}dinaphtho[2,1-d:1′,2′-f]- [1,3,2]dioxaphosphepin}rhodium(I) [RhI{(R,S)-binaphos}] Derivatives
作者:Koji Nakano、Ryo Tanaka、Kyoko Nozaki
DOI:10.1002/hlca.200690166
日期:2006.8
The asymmetric hydroformylation of 2- and 3-vinylfurans (2a and 2b, resp.) was investigated by using [Rh(R,S)-binaphos}] complexes as catalysts ((R,S)-binaphos = (11bS)-4-[1R)-2′-phosphino[1,1′-binaphthalen]-2-yl]oxy}dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin; 1). Hydroformylation of 2 gave isoaldehydes 3 in high regio- and enantioselectivities (Scheme 2 and Table). Reduction of the aldehydes
的2-和3- vinylfurans的不对称氢甲酰化(图2a和2b中,RESP)通过使用调查的[Rh (R,S)-binaphos}]络合物作为催化剂((R,S)-binaphos =(11B小号) -4-[1 R)-2'-膦基[1,1'-双萘] -2-基]氧基} dinaphtho [2,1- d:1',2'- f ] [1,3,2 ]二氧杂磷醚; 1)。2的加氢甲酰化产生具有高区域选择性和对映选择性的异醛3(方案2和表)。用NaBH 4还原醛3成功地提供了相应的醇5而没有损失对映体纯度(方案3)。