Synthesis and Optical Resolution of Aminophosphines with Axially Chiral C(aryl)−N(amine) Bonds for Use as Ligands in Asymmetric Catalysis
作者:Takashi Mino、Youichi Tanaka、Youtaro Hattori、Toshihiro Yabusaki、Hiroaki Saotome、Masami Sakamoto、Tsutomu Fujita
DOI:10.1021/jo061261f
日期:2006.9.1
substitution (SNAr) reaction followed by silane reduction. Aminophosphine 1d was also prepared from 2,3-difluorobenzaldehyde (4) via dimethylhydrazone. Optical resolution of C(aryl)−N(amine) bond atropisomers was achieved using (S)-(+)-di-μ-chlorobis[2-[(dimethylamino)ethyl]phenyl-C2,N]dipalladium(II) ((S)-10). The determination of absolute configuration and the investigation of the rotation barrier
ñ -芳基二氢吲哚型氨基膦1A - Ç通过亲核芳族取代(S以良好产率得到Ñ AR)反应,接着还原硅烷。氨基膦1d也由2,3-二氟苯甲醛(4)经二甲基hydr制备。的C光学分辨率(芳基)-N(胺)键阻转异构体,采用(实现小号) - (+) -二对μ -氯双[2 - [(二甲基氨基)乙基]苯基- c ^ 2,Ñ基]二钯(II) ((小号)-10)。描述了氨基膦1的C(芳基)-N(胺)键轴向稳定性的绝对构型的确定和旋转势垒的研究。最后,在催化不对称反应中证明了手性膦配体1的能力,例如钯与丙二酸二甲酯(最高95%ee)的钯催化的1,3-二苯基-2-丙烯基乙酸丙烯酯的不对称烯丙基烷基化反应。