Sulfoxide-Directed Enantioselective Synthesis of Functionalized Tetrahydropyridines
摘要:
The highly selective base-promoted cyclization of enantiopure sulfinyl dienamines provides stereodefined sulfinyl 1,2,3,6-tetrahydropyridines (dr up to 99:1). Subsequent sigmatropic rearrangement affords tetrahydropyridin-3-ols in good yields and selectivities.
Stereodefined α-iodovinyl sulfoxides bearing a sulfinyl group and an iodo group were prepared by a one-pot iodination/Horner–Wadsworth–Emmons reaction protocol. This reaction can be applied to a wide range of aldehydes, and further application was demonstrated.
Sulfur-Directed Enantioselective Synthesis of Functionalized Dihydropyrans
作者:Roberto Fernández de la Pradilla、Mariola Tortosa、Nadia Lwoff、Miguel A. del Águila、Alma Viso
DOI:10.1021/jo801029q
日期:2008.9.1
dihydropyrans. The scope of this methodology, including the preparation of seven-membered rings, has been studied in depth. The reactivity of our sulfinyl dihydropyrans toward oxidation, imination, and dihydroxylation has been explored, and thus several routes to densely functionalized pyran derivatives have been outlined. The reactivity of allylic dihydropyranyl sulfones and sulfoximines in S(N)2'
Remote Stereocontrol in the Synthesis of Acyclic 1,4-Diols and 1,4-Aminoalcohols from 2-Sulfinyl Dienes
作者:Roberto Fernández de la Pradilla、Marina Velado、Ignacio Colomer、Carmen Simal、Alma Viso、Heinz Gornitzka、Catherine Hemmert
DOI:10.1021/ol502592y
日期:2014.10.3
The highly diastereoselective conjugate addition of alcohols and amines (RXH) to enantiopure 2-sulfinyl dienes renders transient allylicsulfoxides which undergo sulfoxide–sulfenate rearrangement and sulfenate cleavage providing 2-ene-1,4-diols and 2-ene-1,4-aminoalcohols with up to 99:1 dr. The method allows for the generation of two stereocenters in a single synthetic operation with remote chirality
Highly Diastereoselective Diels-Alder Reactions with Enantiopure Sulfinyl-Substituted 1-Hydroxymethyldienes
作者:Roberto Fernández de la Pradilla、Carlos Montero、Mariola Tortosa、Alma Viso
DOI:10.1002/chem.200500191
日期:2005.8.19
Enantiopure hydroxy-2- and -3-sulfinyldienes undergo highly selective Diels-Alder cycloadditions with various dienophiles controlled by the chiral sulfur atom. The related hydroxy-2-sulfonyldienes display complementary pi-facial selectivity.
Sulfoxide-Directed Intramolecular [4 + 2] Cycloadditions between 2-Sulfinyl Butadienes and Unactivated Alkynes
作者:Roberto Fernández de la Pradilla、Mariola Tortosa、Esther Castellanos、Alma Viso、Raquel Baile
DOI:10.1021/jo9024489
日期:2010.3.5
Sulfinyl dienynes undergo thermal and catalyzed IMDA cycloadditions, often at room temperature, to produce cyclohexa-1,4-dienes with good yields and high selectivities. Additionally, the products preserve a synthetically useful vinyl sulfoxide functionality. The selective manipulation of the double bonds in the cycloadducts has also been examined in this work.