Studies Directed toward the Total Synthesis of Discodermolide: Asymmetric Synthesis of the C1−C14 Fragment
作者:Alexander Arefolov、James S. Panek
DOI:10.1021/ol026139r
日期:2002.7.1
[structure: see text] A convergent and stereoselective assembly of the C1-C14 subunit of marine natural product (+)-discodermolide has been completed. The approach employs chiral allylsilane bond construction methodology to establish four of the eight stereogenic centers. Key fragment coupling is achieved via an efficient stereoselective acetate aldol reaction between C1-C6 and C7-C14 subunits.
Stereoselective Synthesis of Functionalized Trisubstituted Olefins via Palladium(0)-Catalyzed Cross-Coupling Reaction
作者:Alexander Arefolov、Neil F. Langille、James S. Panek
DOI:10.1021/ol016486l
日期:2001.10.1
[reaction: see text]. A highly flexible and stereoselective protocol for the synthesis of branched (E)- and (Z)-trisubstituted alkenes has been developed. The key steps are hydrozirconation-iodination of (1-alkynyl)trimethylsilane followed by Negishi-type cross-coupling. The resultant (Z)-vinyl silane is iododesilylated and subjected to a second cross-couplingreaction to give the trisubstituted olefin