Chiral secondary alcohols are an important class of functionalities commonly seen in drugs and other bioactive compounds.In an ongoing drug discovery program in our laboratories,a nitro-bearing racemic allylic seconda...Chiral secondary alcohols are an important class of functionalities commonly seen in drugs and other bioactive compounds.In an ongoing drug discovery program in our laboratories,a nitro-bearing racemic allylic secondary alcohol (±)-1 was discovered as a promising drug candidate,and in the following preclinical studies,a concise,reliable,practical synthetic approach to its both enantiomers with high optical purities was greatly needed.In the present study,we developed a chiral resolution approach of (±)-1 to its both enantiomers,i.e.,(+)-1 and (-)-1,via the strategy of diastereomeric ester formation and crystallization using both N-Boc-D- and N-Boc-L-phenylglycines as chiral auxiliaries.The absolute configurations of all the four key intermediates were unambiguously determined by single-crystal X-ray diffraction,providing a solid foundation for the stereochemistry of the present study.The two enantiomers were obtained in high optical purities.This approach is characterized by scalability and practicality and is envisaged to enable the chiral resolution of other racemic secondary alcohols,especially those with labile groups,such as NO_(2);olefinic C=C bond.展开更多
基金supported by the Guangdong Basic and Applied Basic Research Foundation,China (Nos.2021A1515010197,2023A1515012259)the Zhongshan Municipal Natural Science Foundation,China (Nos.200805173640573,210730214049987,221018194369472)+1 种基金the Project of the Creative Research Group of Zhongshan City,China (No.CXTD2022011)Dazhou Applied Basic Research Foundation,China (No.23YYJC0002).
文摘Chiral secondary alcohols are an important class of functionalities commonly seen in drugs and other bioactive compounds.In an ongoing drug discovery program in our laboratories,a nitro-bearing racemic allylic secondary alcohol (±)-1 was discovered as a promising drug candidate,and in the following preclinical studies,a concise,reliable,practical synthetic approach to its both enantiomers with high optical purities was greatly needed.In the present study,we developed a chiral resolution approach of (±)-1 to its both enantiomers,i.e.,(+)-1 and (-)-1,via the strategy of diastereomeric ester formation and crystallization using both N-Boc-D- and N-Boc-L-phenylglycines as chiral auxiliaries.The absolute configurations of all the four key intermediates were unambiguously determined by single-crystal X-ray diffraction,providing a solid foundation for the stereochemistry of the present study.The two enantiomers were obtained in high optical purities.This approach is characterized by scalability and practicality and is envisaged to enable the chiral resolution of other racemic secondary alcohols,especially those with labile groups,such as NO_(2);olefinic C=C bond.
