SPIRO-BISPHOSPHOROUS COMPOUND, AND PREPARATION AND APPLICATION THEREOF
申请人:Guangdong OXO Chem Ltd.
公开号:US20220242891A1
公开(公告)日:2022-08-04
Disclosed are a spiro-bisphosphorous compound, and a preparation and application thereof. The spiro-bisphosphorous compound is expressed in formula (I), (II) or (III).
SYNTHESIS AND APPLICATION OF OXASPIROCYCLODIPHOSPHINE LIGAND
申请人:SHENZHEN CATALYS TECHNOLOGY CO., LTD.
公开号:EP3730502A1
公开(公告)日:2020-10-28
The present invention relates to the technical field of chiral synthesis, and specifically provides the synthesis and use of 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 acids. The complex of the ligand with ruthenium can achieve an enantioselectivity of greater than 99% in the asymmetric hydrogenation of methyl-cinnamic acid.