Indium triflate-catalyzed allylation reactions of N-sulfonyl aldimines or N-alkoxycarbonylamino p-tolylsulfones with allyltrimethylsilane: synthesis of protected homoallylic amines
作者:Ponnaboina Thirupathi、Sung Soo Kim
DOI:10.1016/j.tet.2010.09.038
日期:2010.11
Indium triflate-catalyzed allylation reactions of N-sulfonyl aldimines or N-alkoxyloxycarbonylamino p-tolylsulfone with allyltrimethylsilane have been successfully developed to produce protected homoallylic amines.
general efficient organocatalyst suitable for various types of anti-Mannichreactions and broad substrate scope. Excellent results (up to 98% yield, >99% ee and >99 : 1 dr) were achieved with 5 mol% catalyst load. Sulfones with ortho substituents or very strong withdrawing groups on the aromatic ring, which have been regarded as challenging substrates in the direct anti-Mannichreactions of aldehydes with
Three-Component Synthesis of α-Aminoperoxides Using Primary and Secondary Dialkylzinc Reagents with O<sub>2</sub> and α-Amido Sulfones
作者:Alicia Monleón、Marc Montesinos-Magraner、Amparo Sanz-Marco、Gonzalo Blay、José R. Pedro
DOI:10.1021/acs.orglett.0c01692
日期:2020.7.17
synthesis of unprecedented α-aminoperoxides bearing primary and secondary alkylperoxide substituents is described. Commercially available dialkylzinc reagents are oxidized with molecular oxygen and the consequent peroxide species react with stable (hetero)aromatic and aliphatic α-amido sulfones in excellent yields (>90%). The now available α-aminoperoxides are of potential interest in medicinal chemistry
Enantioselective Zinc/BINOL-Catalysed Alkynylation of Aldimines Generated in Situ from α-Amido Sulfones
作者:Gonzalo Blay、Ana Brines、Alicia Monleón、José R. Pedro
DOI:10.1002/chem.201102909
日期:2012.2.20
amines have been prepared by the addition of terminal alkynes to imines generated in situfrom α‐amido sulfones in the presence of diethylzinc and BINOL‐type ligands as catalysts. The reactions give good yields and high enantioselectivities (ee values up to 95 %) for a good number of aromatic and heteroaromatic α‐amido sulfones and alkynes.
Solventless DBU-promoted Mannich-type reactions of α-amido p-tolylsulfones with diethyl fluoromalonates and diethyl malonates
作者:Santosh T. Kadam、Sung Soo Kim
DOI:10.1016/j.tet.2010.05.075
日期:2010.7
Mannich-type reactions of α-amido p-tolylsulfones with diethyl fluoromalonates and diethylmalonates, respectively in presence of catalytic amount of DBU have been developed. A variety of α-amido p-tolylsulfones prepared from aromatic and aliphatic aldehydes reacts with diethyl fluoromalonates and diethylmalonates, respectively under mild reaction conditions to afford α-fluoro β-amino esters and β-amino