The two hydroxyacid derivatives 10 and 11, obtained from (S)-β-hydroxybutanoate and (S)-lactate, respectively, are joined to give the acetylenic ester 12. Cyclization and functional group manipulations lead to (S,S)-(+)-grahamimycin A1, the enantiomer of the natural product.
将分别从(S)-β-羟基
丁酸酯和(S)-
乳酸酯获得的两种羟酸衍
生物10和11连接起来,得到炔属酯12.环化和官能团的操纵导致(S,S)-(+ )-grahamimycin A 1,
天然产物的对映异构体。