title: Total synthesis of (+)-geldanamycin and (-)-o-quinogeldanamycin with use of asymmetric anti- and syn-glycolate aldol reactions.
abstract: Geldanamycin (GA), an antitumor Hsp90 inhibitor, was made for the first time by using an oxidative demethylation reaction as the final step. A biaryldioxanone auxiliary set the anti C11-12 hydroxy-methoxy functionality and a methylglycolate auxiliary based on norephedrine was used for the syn C6-7 methoxy-urethane. p-Quinone-forming oxidants, CAN and AgO, produced an unusual aza-quinone product. Nitric acid gave GA from a trimethoxy precursor in 55% yield as a 1:10 mixture with nonnatural o-quino-GA. [structure: see text]
mesh_terms: D000903:Antibiotics, Antineoplastic / Q000138:chemical synthesis* / Q000737:chemistry; D016227:Benzoquinones; D018841:HSP90 Heat-Shock Proteins / Q000037:antagonists & inhibitors; D047029:Lactams, Macrocyclic; D015394:Molecular Structure; D011809:Quinones / Q000138:chemical synthesis* / Q000737:chemistry
chemical_list: D000903:Antibiotics, Antineoplastic; D016227:Benzoquinones; D018841:HSP90 Heat-Shock Proteins; D047029:Lactams, Macrocyclic; D011809:Quinones; C469616:quinogeldanamycin; C001277:geldanamycin