First enantiospecific Baker–Venkataraman-rearrangements aiming at the total synthesis of chiral anthrapyran antibiotics
作者:Karsten Krohn、Anne Vidal、Jürgen Vitz、Bernhard Westermann、Muhammad Abbas、Ivan Green
DOI:10.1016/j.tetasy.2006.11.017
日期:2006.11
none esters 6 of 2-methylbutanoic acid or 11 of O-allyl lactic acid proceeds with virtually no racemization to ketides 7 and 12. The subsequent acid-catalyzed cyclization to the chiral anthra[1,2-b]pyran antibiotics such as (S)-1″-11-dideoxyespicufolin 8 or 13 also occurs with a very low racemization.
手性2-乙酰基-1- hydroxyanthraquionone酯的碱催化酰基转移(贝克-卡塔拉曼反应)6的2-甲基丁酸或11的直径: -烯丙基乳酸前进几乎没有外消旋化,以ketides 7和12。随后的手性蒽[1,2- b ]吡喃抗生素,如(S)-1''-11-dideoxyespicufolin 8或13的酸催化环化也发生在非常低的消旋作用下。