The totalsynthesis of (+)-awajanomycin has been achieved by asymmetricallylboration of a vicinal tricarbonyl compound as the key step. A substrate-controlled dihydroxylation and subsequent differentiation of diastereotopic ester groups were used to synthesize the γ-lactone substructure. After formation of the δ-lactam, the bicyclic core structure was established. The synthetic strategy and overall
Application of Vinyl Nucleophiles in Matteson Homologations
作者:Thorsten Kinsinger、Uli Kazmaier
DOI:10.1021/acs.orglett.2c01119
日期:2022.5.27
nucleophiles was found to be a versatile tool for the synthesis of highly substituted and functionalized allyl boronic esters. High yields and stereoselectivities are obtained with sterically demanding alkyl boronic esters and/or Grignard reagents. With the application of such vinyl Matteson homologations, the polyketide fragment of lagunamide B is synthesized.
发现与乙烯基亲核试剂的 Matteson 同系化是合成高度取代和功能化的烯丙基硼酸酯的通用工具。使用空间要求高的烷基硼酸酯和/或格氏试剂可获得高产率和立体选择性。通过应用这种乙烯基 Matteson 同系物,合成了 lagunamide B 的聚酮化合物片段。