The absolute stereochemistry of amphidinolideB (1), a potent cytotoxic 26-membered macrolide isolated from the cultured marine dinoflagellateAmphidiniumsp., has been established as 8S, 9S, 11R, 16R, 18S, 21R, 22S, 23R, and 25S, on the basis of enantiospecific synthesis of a degradation product (2).
Amphidinolides: Unique Macrolides from Marine Dinoflagellates
作者:Jun'ichi Kobayashi、Masami Ishibashi
DOI:10.3987/rev-96-sr1
日期:——
Asymmetric Hydrogenation Approaches to Valuable, Acyclic 1,3-Hydroxymethyl Chirons
作者:Ye Zhu、Kevin Burgess
DOI:10.1021/ja802909b
日期:2008.7.1
An iridium carbene oxazoline complex was used to catalyze hydrogenations of trisubstituted alkenes to give terminal and internal 1,3-hydroxymethyl chirons. The products are accessible in all possible stereoisomeric forms. These hydrogenation do not require strongly coordinating functionalities on the substrate, and in some key cases, catalyst-rather than substrate-controlled stereoselectives are observed. It is hypothesized that these reactions would not be feasible using iridium or rhodium diphosphind complexes.
Chiarello, Jack; Joullie, Madeleine M., Synthetic Communications, 1989, vol. 19, # 19, p. 3379 - 3384
作者:Chiarello, Jack、Joullie, Madeleine M.
DOI:——
日期:——
CHIARELLO, JACK;JOULLIE, MADELEINE M., SYNTH. COMMUN., 19,(1989) N9, C. 3379-3383