Abstract: An eribulin salt formed by combining an eribulin free base with a low molecular weight amine compound through a diacid compound is disclosed. As the diacid compound, edisylic acid, 1,5-naphthalenedisulfonic acid, trans-2-butene-1,4-dicarboxylic acid, pyrophosphoric acid, and combination thereof may be employed. As the amine, ammonia, cyclohexylamine, dicyclohexylamine, and a combination thereof may be employed. The eribulin salt can be crystallized by recrystallization to produce a crystalline eribulin salt with increased purity.
Type:
Application
Filed:
May 6, 2021
Publication date:
July 27, 2023
Applicant:
YONSUNG FINE CHEMICAL CO., LTD.
Inventors:
Areum BAEK, Hyunik SHIN, Yongseo PARK, Seongtaek KIM, Seunghui SIN
Abstract: A new and improved method for preparing maxacalcitol and an intermediate therefor is provided. The method is an efficient and cost-effective process for preparing maxacalcitol and an intermediate therefor.
Type:
Application
Filed:
November 26, 2020
Publication date:
March 2, 2023
Applicant:
YONSUNG FINE CHEMICAL CO., LTD.
Inventors:
Seung Woo KIM, Se Gyo JUNG, In A JUNG, Hyunik SHIN
Abstract: An improved method for preparing lifitegrast is provided. The method is efficient and cost-effective and produces lifitegrast with high purity.
Type:
Application
Filed:
November 20, 2020
Publication date:
January 26, 2023
Applicant:
YONSUNG FINE CHEMICAL CO., LTE,
Inventors:
Hyun Ik SHIN, Eun Im JEONG, Chang Heon SUHL
Abstract: The present invention relates to a process for preparing a compound of formula (6) which is an intermediate for the preparation of eribulin mesylate with high yields and high purity, and an intermediate therefor.
Abstract: The present invention relates to a process for preparing latanoprostene bunod and an intermediate therefor. In accordance with the preparation process of the present invention, latanoprostene bunod can be efficiently and cost-effectively prepared while reducing side reactions.
Type:
Grant
Filed:
August 3, 2018
Date of Patent:
December 22, 2020
Assignee:
YONSUNG FINE CHEMICAL CO., LTD.
Inventors:
Eun Jeong Ko, Hyun Ik Shin, Kee Young Lee, Chang Young Oh
Abstract: The present invention relates to a process for preparing an intermediate for the preparation of eribulin mesylate with high yields, and an intermediate therefor.
Abstract: The present invention relates to a process for preparing a compound of formula (6) which is an intermediate for the preparation of eribulin mesylate with high yields and high purity, and an intermediate therefor.
Abstract: The present invention relates to a cost-effective and efficient method for preparing treprostinil with high purity, and an intermediate therefor.
Type:
Grant
Filed:
April 18, 2017
Date of Patent:
October 13, 2020
Assignee:
YONSUNG FINE CHEMICAL CO., LTD.
Inventors:
Hyun Ik Shin, Hyoseon Lee, Kyung Jin Lee, Kee Young Lee, Changyoung Oh
Abstract: The present invention relates to a process for preparing latanoprostene bunod and an intermediate therefor. In accordance with the preparation process of the present invention, latanoprostene bunod can be efficiently and cost-effectively prepared while reducing side reactions.
Type:
Application
Filed:
August 3, 2018
Publication date:
May 28, 2020
Applicant:
YONSUNG FINE CHEMICAL CO., LTD.
Inventors:
Eun Jeong KO, Hyun Ik SHIN, Kee Young LEE, Chang Young OH
Abstract: An eye drop composition for treating glaucoma is disclosed. The eye drop composition includes a prostaglandin analogue, a thickening agent, and a solubilizing agent, wherein the thickening agent is carboxymethylcellulose or a salt thereof, and the solubilizing agent is tyloxapol.
Type:
Application
Filed:
June 21, 2018
Publication date:
April 30, 2020
Applicant:
YONSUNG FINE CHEMICAL CO., LTD.
Inventors:
Areum BAEK, Youngsik CHUNG, Hyun Ik SHIN, Chang Young OH, Kee Young LEE
Abstract: A method for preparing a 3-((2S,5S)-4-methylene-5-(3-oxopropyl)tetrahydrofuran-2-yl)propanol derivative by a simple process with high yields, and an intermediate useful for the method.
Type:
Grant
Filed:
January 13, 2017
Date of Patent:
January 21, 2020
Assignee:
YONSUNG FINE CHEMICAL CO., LTD.
Inventors:
Hyun Ik Shin, Kee Young Lee, Changyoung Oh
Abstract: The present invention relates to a process for preparing an intermediate for the preparation of eribulin mesylate with high yields, and an intermediate therefor.
Abstract: The present invention relates to a cost-effective and efficient method for preparing treprostinil with high purity, and an intermediate therefor.
Type:
Application
Filed:
April 18, 2017
Publication date:
April 25, 2019
Applicant:
YONSUNG FINE CHEMICAL CO., LTD.
Inventors:
Hyun Ik SHIN, Hyoseon LEE, Kyung Jin LEE, Kee Young LEE, Changyoung OH
Abstract: A method for preparing a 3-((2S,5S)-4-methylene-5-(3-oxopropyl)tetrahydrofuran-2-yl)propanol derivative by a simple process with high yields, and an intermediate useful for the method.
Type:
Application
Filed:
January 13, 2017
Publication date:
January 24, 2019
Applicant:
YONSUNG FINE CHEMICAL CO., LTD.
Inventors:
Hyun Ik SHIN, Kee Young LEE, Changyoung OH
Abstract: The present invention relates to a process for preparing a prostaglandin derivative and an intermediate therefor. In accordance with the present invention, the prostaglandin F (PGF) derivative can be efficiently prepared with high purity by removing the protecting group of a protected prostaglandin E (PGE) derivative obtained from conjugate addition and then stereoselectively reducing the ketone group on the cyclopentanone ring of the PGE derivative.
Type:
Grant
Filed:
March 11, 2010
Date of Patent:
September 8, 2015
Assignee:
YONSUNG FINE CHEMICAL CO., LTD.
Inventors:
Changyoung Oh, Kee Young Lee, Yong Hyun Kim, Jae Eun Joo
Abstract: The present invention relates to a process for preparing a prostaglandin derivative and an intermediate therefor. In accordance with the present invention, the prostaglandin F (PGF) derivative can be efficiently prepared with high purity by removing the protecting group of a protected prostaglandin E (PGE) derivative obtained from conjugate addition and then stereoselectively reducing the ketone group on the cyclopentanone ring of the PGE derivative.
Type:
Application
Filed:
May 23, 2013
Publication date:
September 26, 2013
Applicant:
YONSUNG FINE CHEMICAL CO., LTD.
Inventors:
Changyoung OH, Kee Young LEE, Yong Hyun KIM, Jae Eun JOO
Abstract: The present invention relates to a process for preparing a prostaglandin derivative and an intermediate therefor. In accordance with the present invention, the prostaglandin F (PGF) derivative can be efficiently prepared with high purity by removing the protecting group of a protected prostaglandin E (PGE) derivative obtained from conjugate addition and then stereoselectively reducing the ketone group on the cyclopentanone ring of the PGE derivative.
Type:
Application
Filed:
March 11, 2010
Publication date:
May 3, 2012
Applicant:
YONSUNG FINE CHEMICAL CO., LTD.
Inventors:
Changyoung Oh, Kee Young Lee, Yong Hyun Kim, Jae Eun Joo
Abstract: The present invention provides a process for preparing benzoprostacycline derivatives of formula (1), i.e. 5,6,7-trinor-4,8-inter-m-phenylene PGI2 derivatives, and vinyl tin compounds of formula (III) as starting materials for the same.
Abstract: The present invention relates to a process for effectively preparing prostaglanin derivatives and to a stereospecific alkyl halide containing 15S-alcohol group as a starting material.
Type:
Grant
Filed:
December 22, 2004
Date of Patent:
January 24, 2006
Assignee:
Yonsung Fine Chemical Co.
Inventors:
Won-Hun Ham, Chang-Young Oh, Yong-Hyun Kim, Yiu-Suk Lee, Kee-Young Lee