Stereocontrolled Synthesis of 1,3-Diols from Enones: Cooperative Lewis Base-Mediated Intramolecular Carbonyl Hydrosilylations
摘要:
A streamlined synthesis of beta-hydroxy ketone substrates has been developed to further investigate a recently discovered cooperative Lewis base-mediated intramolecular carbonyl hydrosilylation reaction. The synthesis features an enone beta-borylation/oxidation sequence that has proven to be quite general and high-yielding. This has allowed for additional investigations into the diastereoselectivity of the hydrosilylation reaction through the preparation of important polyketide fragments.
Stereoselective Synthesis of the Southern Hemisphere Acyclic Domain of Neaumycin B
作者:Hiroya Takeshita、Tomoya Sugai、Haruhiko Fuwa
DOI:10.1021/acs.joc.1c00508
日期:2021.5.7
A stereocontrolled synthetic entry to the southern hemisphere C3–C17 acyclic domain of neaumycin B, a highly potent cytotoxic macrolide natural product, has been developed. The present synthesis is based on (i) a tandem olefin cross-metathesis/hemiacetalization/intramolecular oxa-Michael addition, (ii) a regioselective reductive acetal opening for differential protection of the C14 hydroxy group, (iii)