78437-40-8Relevant articles and documents
Stereoselective Synthesis of Diltiazem via Dynamic Kinetic Resolution
Mordant, Celine,De Andrade, Cristina Cano,Touati, Ridha,Ratovelomanana-Vidal, Virginie,Hassine, Bechir Ben,Genet, Jean-Pierre
, p. 2405 - 2409 (2003)
An efficient synthesis of diltiazem has been developed using dynamic kinetic resolution (DKR) as a key step. The methyl (2S,3S)-2-chloro-3-hydroxy-3- (4-methoxyphenyl)propionate was synthesized from a racemic mixture of α-chloro-β-keto ester, with high anti diastereoselectivity (92%) and enantioselectivity (95%), based on an asymmetric hydrogenation reaction with a chiral ruthenium(II) catalyst, simply prepared by mixing Ru(cod)(2-methylallyl) 2 with the atropisomeric ligand (S)-MeO-BIPHEP. By treatment of this α-chloro-β-hydroxy ester with a base, the corresponding trans methyl glycidate, a key intermediate of diltiazem, was easily obtained.
Trimethylchlorosilane-Mediated Mild α-Chlorination of 1,3-Dicarbonyl Compounds Promoted by Phenyliodonium Diacetate
Chong, Siying,Su, Yingpeng,Wu, Lili,Zhang, Weigang,Ma, Junyan,Chen, Xiaowei,Huang, Danfeng,Wang, Ke-Hu,Hu, Yulai
, p. 1359 - 1370 (2016/05/02)
Trimethylchlorosilane was used as chlorine source for the α-chlorination of 1,3-dicarbonyl compounds with phenyliodonium diacetate as oxidant at room temperature. The reaction allows the selective synthesis of α-monochlorinated products from different kinds of 1,3-dicarbonyl compounds in good yield. The potential possibility of this conversion for bromination has also been investigated.
Process for preparing 2-halogeno-3-hydroxy-3-phenyl-propionic acid ester compounds
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, (2008/06/13)
Disclosed is a process for preparing 2-halogeno-3-hydroxy-3-phenylpropionic acid ester compounds represented by the formula (I): STR1 wherein Ring A is a phenyl group which may be substituted, R1 is an ester residue, and X is a halogen atom, which comprises permitting an enzyme having the ability of stereoselectively reducing oxo group to hydroxy group to act on 2-halogeno-3-oxo-3-phenylpropionic acid ester compounds represented by the formula (II): STR2 wherein Ring A, R1 and X have the same meanings as defined above.