Total Syntheses of (+)-Acutiphycin and (+)-trans-20,21-Didehydroacutiphycin
摘要:
The first total syntheses of the cytotoxic macrolides (+)-acutiphycin (1) and (+)-trans-20,21-didehydroacutiphycin (2) have been achieved. An acyclic stereocontrol strategy was employed to establish the configurations at C(5), C(10), and C(13) as well as the E geometry of the C(8,9)-trisubstituted olefin. Importantly, the natural source of 1 and 2, the blue-green alga Osillatoria acutissima, no longer produces these metabolites.
The synthesis of a C1–C14 fragment of the macrolide antibiotic gulmirecin B through formation of the C7–C8 bond by addition of a vinyllithium intermediate to a C1–C7 aldehyde was investigated. This crucial coupling was successful with a vinyllithium reagent corresponding to a C8–C12 fragment. The C8–C12 vinyl bromide was prepared from l -malic acid. The C1–C7 aldehyde building block was synthesized
Total Syntheses of (+)-Acutiphycin and (+)-<i>trans</i>-20,21-Didehydroacutiphycin
作者:Amos B. Smith、Sean S.-Y. Chen、Frances C. Nelson、Janice M. Reichert、Brian A. Salvatore
DOI:10.1021/ja972497r
日期:1997.11.1
The first total syntheses of the cytotoxic macrolides (+)-acutiphycin (1) and (+)-trans-20,21-didehydroacutiphycin (2) have been achieved. An acyclic stereocontrol strategy was employed to establish the configurations at C(5), C(10), and C(13) as well as the E geometry of the C(8,9)-trisubstituted olefin. Importantly, the natural source of 1 and 2, the blue-green alga Osillatoria acutissima, no longer produces these metabolites.
Total Syntheses of (+)-Acutiphycin and (+)-trans-20,21-Didehydroacutiphycin
作者:Amos B. Smith、Sean S.-Y. Chen、Frances C. Nelson、Janice M. Reichert、Brian A. Salvatore