Diastereoselective synthesis of (±)-epianastrephin, (±)-anastrephin and analogs thereof
申请人:The United States of America, as Represented by the Secretary of Agriculture
公开号:US10011580B2
公开(公告)日:2018-07-03
A process for the synthesis of trans-fused γ-lactones having Formula (IV) from substituted cyclic ketones having Formula (I). A diastereoselective synthesis of (±)-epianastrephin (1) (wherein: R1 is ethenyl, R2 and R3 is methyl, and n is 1), (±)-anastrephin (2) (wherein: R2 is ethenyl, R1 and R3 is methyl and n is 1), and analogs thereof (wherein: R1 is H, C1-5 alkyl, C2-6 alkenyl or C2-6 alkynyl, R2 is H, C1-5 alkyl, C2-6 alkenyl or C2-6 alkynyl, R1 and R2 together with the carbon atom they are attached form a C3-6 cycloalkyl ring, R3 is C1-5 alkyl and n is 0-2):
一种从具有式(I)的取代环酮合成具有式(IV)的反式融合γ-内酯的工艺。一种非对映选择性合成(±)-epianastrephin (1)(其中:R1 是乙烯基,R2 和 R3 是甲基,n 是 1)、(±)-anastrephin (2)(其中:R2 是乙烯基,R1 和 R3 是甲基,n 是 1)及其类似物(其中:R1为H、C1-5烷基、C2-6烯基或C2-6炔基,R2为H、C1-5烷基、C2-6烯基或C2-6炔基,R1和R2与它们所连接的碳原子一起形成一个C3-6环烷基环,R3为C1-5烷基,n为0-2):