The present invention relates to the technical field of chiral synthesis, and specifically provides a new type of oxa-spirodiphosphine ligands. The bisphosphine ligand is prepared with oxa-spirobisphenol as a starting material after triflation, palladium catalyzed coupling with diaryl phosphine oxide, reduction of trichlorosilane, further palladium catalyzed coupling with diaryl phosphine oxide, and further reduction of trichlorosilane. The oxa-spiro compound has central chirality, and thus includes L-oxa-spirodiphosphine ligand and R-oxa-spirodiphosphine ligand. The racemic spirodiphosphine ligand is capable of being synthesized from racemic oxa-spirobisphenol as a raw material. The present invention can be used as a chiral ligand in the asymmetric hydrogenation of unsaturated carboxylic adds. The complex of the ligand with ruthenium can achieve an enantioselectivity of greater than 99% in the asymmetric hydrogenation of methyl-cinnamic acid.
本发明涉及手性合成技术领域,具体提供了一种新型的氧杂环螺环二
膦配体。该双
膦配体是通过氧杂环螺双
苯酚作为起始材料,经过三
氟甲磺酰化、
钯催化偶联二芳基氧膦、三
氯硅烷还原、进一步的
钯催化偶联二芳基氧膦和进一步的三
氯硅烷还原制备而成。氧杂环螺化合物具有中心手性,因此包括L-氧杂环螺环二
膦配体和R-氧杂环螺环二
膦配体。外消旋螺环二
膦配体可从外消旋氧杂环螺双
苯酚作为原料合成。本发明可用作不饱和
羧酸不对称氢化的手性
配体。该
配体与
钌的配合物在
对甲基肉桂酸的不对称氢化中可实现大于99%的对映选择性。