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Total Synthesis of (+/-)-Ramariolides C and D

Author:
Kuse, Masaki  Moriguchi, Maiko  Hachida, Masashi  Takikawa, Hirosato  


Journal:
CHEMISTRY LETTERS


Issue Date:
2017


Abstract(summary):

Ramariolides A-D (1-4) were isolated from the coral mushroom Ramaria cystidiophora, out of which 1 showed in vitro antimicrobial activity. The structural features of 1-4 are attractive synthetic targets. Here, we report the total synthesis of ramariolides C (3) and D (4). The vinylogous Mukaiyama aldol reaction was employed to construct the carbon skeletons of 3 and 4. The key precursors for the reaction were alpha-hydroxyaldehydes, which were prepared from cyanohydrins via reduction with diisobutylaluminum hydride (DIBAL). Successive acetylation of the aldol adducts and an elimination reaction of the resulting acetates yielded 3 and 4 upon treatment with tetra-n-butylammonium fluoride (TBAF) and acetic acid.


Page:
1409---1411


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