title: Ring-closing metathesis-based synthesis of (3R,4R,5S)-4-acetylamino-5-amino-3-hydroxy- cyclohex-1-ene-carboxylic acid ethyl ester: a functionalized cycloalkene skeleton of GS4104.
abstract: (3R,4R,5S)-4-Acetylamino-5-amino-3-hydroxy-cyclohex-1-ene-carboxylic acid ethyl ester, a functionalized cyclohexene skeleton of GS4104, was diastereoselectively synthesized. A major advantage of this synthesis is the use of readily available L-serine to replace frequently used (-)-shikimic acid or (-)-quinic acid as the starting material. Ring-closing metathesis and diastereoselective Grignard reactions successfully served as the key steps. Absolute configurations of the key intermediates were confirmed by corresponding two-dimensional NMR studies.
authors.affiliation: State Key Laboratory of Bioorganic and Natural Product Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Road, Shanghai 200032, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Cong
authors.forename: Zhu-Jun
authors.initials: ZJ
authors.lastname: Yao
mesh_terms: D003500:Cyclization; D053138:Cyclohexenes / Q000138:chemical synthesis* / Q000737:chemistry; D003516:Cycloparaffins / Q000737:chemistry*; D004952:Esters / Q000138:chemical synthesis* / Q000737:chemistry; D008968:Molecular Conformation; D053139:Oseltamivir / Q000737:chemistry*; D013237:Stereoisomerism
chemical_list: C520591:(3R,4R,5S)-4-acetylamino-5-amino-3-hydroxy- cyclohex-1-ene-carboxylic acid ethyl ester; D053138:Cyclohexenes; D003516:Cycloparaffins; D004952:Esters; D053139:Oseltamivir