Concise Synthesis of Tetrahydropyrans by a Tandem Oxa-Michael/Tsuji-Trost Reaction
作者:Liang Wang、Pengfei Li、Dirk Menche
DOI:10.1002/anie.201003304
日期:2010.11.22
A novel domino sequence facilitates the rapid assembly of polysubstituted tetrahydropyrans. The one‐pot relay process generates up to three new stereogenic centers, including a tetrasubstituted carbon center, in a highly concise and convergent fashion from simple starting materials.
Construction of Multisubstituted Tetrahydropyrans by a Domino Oxa-Michael/Tsuji–Trost Reaction
作者:Liang Wang、Dirk Menche
DOI:10.1021/jo302102x
日期:2012.12.7
Biologically significant tetrahydropyrans (THP) were synthesized by a Tandemoxa-Michael/Tsuji–Trostreaction. Different Michael acceptors were investigated, and optimal results in terms of diastereoselectivities and yields were obtained with nitro olefins. The influence of the reaction parameters, substrate patterns, and type of metal counterions on the yield and stereochemical outcome of this process
Hydrogen bonds can play a prominent role in organometallic catalysis, as shown for the title reaction, in which a counteranion directs the cyclization through the formation of hydrogen bonds that likely involve a proton of the π‐allyl/palladium species itself. The reaction allows access to four out of the eight stereoisomers of 2,5‐disubstitued 3‐hydroxy‐tetrahydrofurans and thus fragments of complex
A highly enantioselectiveallylic substitution of (Z)-but-2-ene-1,4-diol derivatives was developed using a rhodium(I) catalyst and arylboronic acids as nucleophiles. The reaction yields versatile homoallylicalcohols from readily available linear biscarbonates. homoallylicalcohols - rhodium - boronic acids - desymmetrization - asymmetric allylic substitution