Assignment of Absolute Configuration to SCH 351448 via Total Synthesis
作者:Lael L. Cheung、Shinji Marumoto、Christopher D. Anderson、Scott D. Rychnovsky
DOI:10.1021/ol8011474
日期:2008.7.17
The synthesis and absoluteconfiguration of SCH 351448, an interesting ionophoric natural product, are reported herein. Mukaiyama aldol-Prins and segment-coupling Prins reactions were employed to construct the constituent tetrahydropyrans of SCH 351448. Efforts to assemble the C2-symmetric core of the natural product by a templated olefin metathesis strategy are described; however, a stepwise fragment
A facile asymmetric synthesis of the octalactinlactone was developed staring from (R)-cyclohexylideneglyceraldehyde (1). The key step of the synthesis is an In-mediated diastereoselective crotylation of 1 in water, which furnished the building blocks with the required stereochemistry under operationally simple conditions. Their conversion to the appropriate intermediates, invertive esterification