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:US20170305874A1
公开(公告)日:2017-10-26
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: R
1
is ethenyl, R
2
and R
3
is methyl, and n is 1), (±)-anastrephin (2) (wherein: R
2
is ethenyl, R
1
and R
3
is methyl and n is 1), and analogs thereof (wherein: R
1
is H, C
1-5
alkyl, C
2-6
alkenyl or C
2-6
alkynyl, R
2
is H, C
1-5
alkyl, C
2-6
alkenyl or C
2-6
alkynyl, R
1
and R
2
together with the carbon atom they are attached form a C
3-6
cycloalkyl ring, R
3
is C
1-5
alkyl and n is 0-2):
从具有化学式(I)的取代环状酮合成具有化学式(IV)的反式γ-内酯的过程。对(±)-epianastrephin(1)进行立体选择合成(其中:R1为乙烯基,R2和R3为甲基,n为1),(±)-anastrephin(2)进行立体选择合成(其中:R2为乙烯基,R1和R3为甲基,n为1),以及它们的类似物(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与它们附着的碳原子一起形成C3-6环烷基环,R3为C1-5烷基,n为0-2)。