title: Convergent total synthesis of (+)-mycalamide A.
abstract: The details of a convergent total synthesis of (+)-mycalamide A are described. Yb(OTf)3-TMSCl-catalyzed cross-aldol reaction conditions are used to synthesize the right segment of mycalamide A. In this reaction, an acid-sensitive aldehyde reacts with methyl trimethylsilyl dimethylketene acetal without epimerization to provide the desired aldol adduct. Additionally, a tetrahydropyran ring, which is the left segment of mycalamide A, is prepared using a novel one-pot delta-lactone formation methodology. Both segments are constructed from a common starting material, d-mannitol. These segments are then coupled in the presence of BuLi, and the functional groups are transformed to complete the synthesis of (+)-mycalamide A.
authors.affiliation: Department of Chemistry, Graduate School of Science, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan.
authors.forename: Natsuko
authors.initials: N
authors.lastname: Kagawa
authors.forename: Masataka
authors.initials: M
authors.lastname: Ihara
authors.forename: Masahiro
authors.initials: M
authors.lastname: Toyota
mesh_terms: D000447:Aldehydes / Q000737:chemistry; D002384:Catalysis; D002625:Chemistry, Organic / Q000379:methods*; D009682:Magnetic Resonance Spectroscopy; D008353:Mannitol / Q000737:chemistry; D015394:Molecular Structure; D011714:Pyrans / Q000138:chemical synthesis* / Q000737:chemistry
chemical_list: D000447:Aldehydes; D011714:Pyrans; C059646:mycalamide A; D008353:Mannitol; C116609:3-hydroxybutanal