Unified Approach to Isoindolinones and THIQs via Lewis Acid Catalyzed Domino Mukaiyama–Mannich Lactamization/Alkylations: Application in the Synthesis of (±)-Homolaudanosine
作者:Sivasankaran Dhanasekaran、Anirban Kayet、Arun Suneja、Vishnumaya Bisai、Vinod K. Singh
DOI:10.1021/acs.orglett.5b01197
日期:2015.6.5
variety of isoindolinones and tetrahydroisoquinolines via a Lewis acid catalyzed domino Mukaiyama–Mannich lactamization/alkylation is achieved. This transformation comprises a sequential formation of three new bonds through a one-pot, three-component procedure to afford product in moderate to high yields. A concise synthesis of (±)-homolaudanosine (2b) has been achieved using this method.
AbstractIn this work, the development of exo‐olefin compounds (R−CH2C(=CH2)Z) as chain‐transfer agents for the sulfur‐free reversible addition‐fragmentation chain transfer (RAFT) radical polymerization of methacrylates in homogeneous solution is described. A series of exo‐olefin compounds with a methyl methacrylate (MMA) dimer structure as the R group and a substituted α‐methylstyrene unit as the −CH2C(=CH2)Z (Z: Ph−Y) group were synthesized and used for the radical polymerization of MMA in toluene and PhC(CF3)2OH. These compounds underwent transfer of the CH2C(=CH2)Z group via addition‐fragmentation of the propagating methacryloyl radical. More electron‐donating (Y) substituents, such as methoxy and dimethylamino groups, produced polymers with narrower molecular weight distributions. A continuous monomer addition method further improved molecular weight control and enabled the synthesis of colorless, sulfur‐free, multiblock copolymers of methacrylates in homogeneous solutions.