A simple and efficient stereoselective totalsynthesis of desacetylumuravumbolide (1a) and umuravumbolide (1b), starting from commercially available valeraldehyde has been described. The synthetic strategy involves a highly enantioselective zinc-mediated addition of protected 2 alkyn-1-ol to aldehyde, a Crimmins aldol reaction, and Horner–Wadsworth–Emmons olefination as key steps.
A simple and efficient stereoselective totalsynthesis of (+)‐umuravumbolide (1b) and (−)‐deacetylumuravumbolide (1a) starting from commercially available pentanal is described. The synthesis involves Sharpless asymmetric epoxidation, Jacobsen's hydrolytic kinetic resolution (HKR), and the Yamaguchi oxirane opening as key steps (Scheme 2).
Asymmetric Synthesis of Umuravumbolide<sup>1</sup>
作者:M. Venkat Ram Reddy、John P. Rearick、Nyssa Hoch、P. Veeraraghavan Ramachandran
DOI:10.1021/ol006583z
日期:2001.1.1
[figure: see text] This first asymmetric synthesis of enantiopure desacetylumuravumbolide and umuravumbolide via asymmetric reduction, allylboration, and ring-closing metathesis confirms their revised structures and configurations. A convenient procedure to upgrade the enantiopurity of alpha,beta-acetylenic alcohols is also described.
Total Synthesis of Umuravumbolide and Hyptolide Through Silicon-Tethered Ring-Closing Metathesis
作者:Partha Sarathi Chowdhury、Pradeep Kumar
DOI:10.1002/ejoc.201300302
日期:2013.7
The totalsynthesis of umuravumbolide and hyptolide has been achieved in a efficient manner by using temporary silicon-tethered ring-closing metathesis and cross-coupling reactions as key steps. The stereogenic centres were generated by means of proline-catalysed α-aminoxylation of aldehydes and Brown's asymmetric allylation method.