Oxa-spiral diphosphine ligand and application thereof in alpha, beta-unsaturated carboxylic acid asymmetric hydrogenation

Abstract

The invention provides an oxa-spiral diphosphine ligand. The oxa-spiral diphosphine ligand has a structure shown by a general formula (I) as shown in description, wherein R1, R2, R3 and R4 in the general formula (I) are same and are alkyl, alkoxy, aryl, aroxyl, or hydrogen atoms; R1, R2, R3 and R4 comprise forms of ring formation, non-ring formation, any two ring formation or multiple-ring formation between pairs; R5 and R6 are alkyl, aryl or hydrogen atoms; and R7 and R8 are alkyl or benzyl or aryl. The invention further provides application of the oxa-spiral diphosphine ligand O-SDP in the alpha, beta-unsaturated carboxylic acid asymmetric hydrogenation. A complex of the oxa-spiral diphosphine ligand O-SDP and ruthenium has excellent activity and enantioselectivity in the asymmetric hydrogenation of the alpha, beta-unsaturated carboxylic acid in multiple types, and a chiral carboxylic acid product is obtained with the enantioselectivity being up to 99%. The synthesis method can be applied to the construction of a core skeleton of chemical molecules with important activity, wherein the chemical molecules comprise Paroxetine, Femoxetine, nipecotic acid and Sacubitril.

Description

technical field [0001] The invention relates to an oxaspirocyclic bisphosphine ligand O-SDP and its application in the asymmetric hydrogenation of α,β-unsaturated carboxylic acids. Background technique [0002] Chiral carboxylic acids and their chiral carboxylic acid derivative fragments widely exist in biologically active drug molecules and natural products, and have high potential application value in the field of asymmetric catalysis. Catalytic asymmetric hydrogenation of α,β-unsaturated carboxylic acids is one of the most direct and efficient methods to construct chiral carboxylic acid compounds. Over the past few decades, this field has undergone rapid development with the development of chiral bisphosphine ligands. DIOP synthesized by Kagan group (see Dang, T.P.; Kagan, H.B.J. Chem. Soc. D: Chem. Commun. 1971, 481.), BINAP developed by Noyori group (see Miyashita , A.; Yasuda , A.; Takaya , H.; Toriumi , K.; Ito , T.; Souchi , T.; Noyori R.; J. Am. Chem. ...

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Problems solved by technology

In 2007, Zhou Qilin's group found that the ruthenium complex of SFDP exhibited excellent activity and enantioselectivity in the hydrogenation of tiglic acid and α-methylcinnamic acid (see X.Cheng, Q.Zhang, J.-H .Xie, L.-X.Wang, Q.-L.Zhou, Angew.Chem., Int.Ed.2005,44,1118-1121.), followed by ChenPhos and Trifer based on the ferrocene framework developed by Chen Weiping's group Shows good catalytic effect in the hydrogenation of α-methylcinnamic acid and α-oxo-α,β-unsaturated acids (see a) W.Chen, P.J.McCormack, K.Mohammed, W.Mbafor, S.M.Roberts , J.Whittall, Angew.Chem., Int.Ed.2007, 46, 4141-4144; b) W.Chen, F.Spindler, B.Pugin, U.Nettekoven, Angew.Chem., Int.Ed.2013 , 52, 8652-8656.), Zhang Xumu group also developed Wudaphos based on ferrocene skeleton, which showed excellent activity and enantioselectivity in the hydrogenation of α-acrylic acid derivation (see Chen, C.; Wang, H.; Zhang, Z., Jin, S.; Wen, S., Ji, J., Chung, L.W. Dong, X.-Q.; Zhang, X. Chem. Sci., 2016, 7, 6669-6673 .), but the scope of application of these ligands is very narrow. In order to obtain excellent enantioselectivity, it is often necessary to car

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