Unknown

Dataset Information

0

Development of a general, sequential, ring-closing metathesis/intramolecular cross-coupling reaction for the synthesis of polyunsaturated macrolactones.


ABSTRACT: A general strategy for the construction of macrocyclic lactones containing conjugated Z,Z-1,3-diene subunits is described. The centerpiece of the strategy is a sequential ring-closing metathesis (RCM) that forms an unsaturated siloxane ring, followed by an intramolecular cross-coupling reaction with a pendant alkenyl iodide. A highly modular assembly of the various precursors allowed the preparation of unsaturated macrolactones containing 11-, 12-, 13-, and 14-membered rings. Although the RCM process proceeded uneventfully, the intramolecular cross-coupling required extensive optimization of palladium source, solvent, fluoride source, and particularly fluoride hydration level. Under the optimal conditions (including syringe pump high dilution), the macrolactones were produced in 53-78% yield as single stereoisomers. A benzo-fused 12-membered-ring macrolactone containing an E,Z-1,3-diene unit was also prepared by the same general strategy. The E-2-styryl iodide was prepared by a novel Heck reaction of an aryl nonaflate with vinyltrimethylsilane followed by iododesilylation with ICl.

SUBMITTER: Denmark SE 

PROVIDER: S-EPMC2923678 | biostudies-literature | 2010 Aug

REPOSITORIES: biostudies-literature

altmetric image

Publications

Development of a general, sequential, ring-closing metathesis/intramolecular cross-coupling reaction for the synthesis of polyunsaturated macrolactones.

Denmark Scott E SE   Muhuhi Joseck M JM  

Journal of the American Chemical Society 20100801 33


A general strategy for the construction of macrocyclic lactones containing conjugated Z,Z-1,3-diene subunits is described. The centerpiece of the strategy is a sequential ring-closing metathesis (RCM) that forms an unsaturated siloxane ring, followed by an intramolecular cross-coupling reaction with a pendant alkenyl iodide. A highly modular assembly of the various precursors allowed the preparation of unsaturated macrolactones containing 11-, 12-, 13-, and 14-membered rings. Although the RCM pr  ...[more]

Similar Datasets

| S-EPMC3858481 | biostudies-literature
| S-EPMC3656481 | biostudies-literature
| S-EPMC5157775 | biostudies-literature
| S-EPMC1424675 | biostudies-literature
| S-EPMC5247355 | biostudies-literature
| S-EPMC4578432 | biostudies-literature
| S-EPMC2879020 | biostudies-literature
| S-EPMC2908527 | biostudies-literature
| S-EPMC5870159 | biostudies-literature
| S-EPMC3871858 | biostudies-literature