Organocatalytic Direct Vinylogous Michael Addition of α,β-Unsaturated γ-Butyrolactam to α,β-Unsaturated Aldehydes and an Illustration to Scaffold Diversity Synthesis
Ideal for scaffold diversity synthesis: The first organocatalytic direct vinylogous Michaeladdition of N‐Boc α,β‐unsaturated γ‐butyrolactam to α,β‐unsaturated aldehydes has been developed. The products with multiple orthogonal sets of functionalities were transformed into diverse enantioenriched natural‐product‐like or drug‐like molecules with fused bi‐, tri‐, or polycyclic scaffolds (see scheme)
Synthesis of PDE IVb Inhibitors. 3. Synthesis of (+)-, (−)-, and (±)-7-[3-(Cyclopentyloxy)-4-methoxyphenyl]hexahydro-3<i>H</i>-pyrrolizin-3-one via Reductive Domino Transformations of 3-β-Carbomethoxyethyl-Substituted Six-Membered Cyclic Nitronates
作者:Alexey Yu. Sukhorukov、Yaroslav D. Boyko、Yulia V. Nelyubina、Stephane Gerard、Sema L. Ioffe、Vladimir A. Tartakovsky
DOI:10.1021/jo300955n
日期:2012.6.15
highly potent PDEIVbinhibitor 1 were developed. The suggested approach is based on reductivedominotransformations of 3-β-carbomethoxyethyl-substitutedsix-memberedcyclicnitronates, which are easily accessed by a stereoselective [4 + 2] cycloaddition of an appropriate nitroalkene to vinyl ethers. In vitro studies of PDEIVb inhibition by enantiomeric pyrrolizidinones (+)-1 and (−)-1 were performed