Synthesis of (-)-Monanchoradin A and (-)-Crambescin A2 392 Based on a Cyclization-Carbonylation-Cyclization Cascade.

Syntheses of guanidino alkaloids (-)-monanchoradin A and (-)-crambescin A2 392 are described. The key feature of the syntheses is the cyclization-carbonylation-cyclization cascade of the optically active propargyl guanidine. The bicyclic guanidino cores bearing an asymmetric center and ester or carboxylic acid functionality were constructed in a single step.

Cyclization-Carbonylation of 2-Alkynyl Primary Benzamides using Benzoquinone under Neutral Conditions.

A palladium-catalyzed cyclization-carbonylation of 2-alkynyl primary benzamides afforded methyl 3-substituted 1-methoxyisoquinoline-4-carboxylates in good to moderate yields. In the case of mesylate , was obtained directly via a cyclization-carbonylation-cyclization cascade. Compounds were converted to isoquinolin-1(2)-ones in good yields under microwave irradiation.

A Polymer-based Piezoelectric Vibration Energy Harvester with a 3D Meshed-Core Structure.

In this study, we fabricated a flexible 3D mesh structure with periodic voids by using a 3D lithography method and applying it to a vibration energy harvester to lower resonance frequency and increase output power. The fabrication process is mainly divided into two parts: three-dimensional photolithography for processing a 3D mesh structure, and a bonding process of piezoelectric films and the mesh structure. With the fabricated flexible mesh structure, we achieved the reduction of resonance frequency and improvement of output power, simultaneously.

Bimorph piezoelectric vibration energy harvester with flexible 3D meshed-core structure for low frequency vibration.

This paper proposes a bimorph piezoelectric vibration energy harvester (PVEH) with a flexible 3D meshed-core elastic layer for improving the output power while lowering the resonance frequency. Owing to the high void ratio of the 3D meshed-core structure, the bending stiffness of the cantilever can be lowered. Thus, the deflection of the harvester and the strain in the piezoelectric layer increase.