[reaction: see text] The 1,4-dipole derived from isoquinoline and DMAD has been shown to react readily with N-tosylimines resulting in the diastereoselective synthesis of 2H-pyrimido[2,1-a]isoquinoline derivatives.

Aesthetic designs from nature enable new knowledge to be gained and, at the same time, inspire scientific models. In this context, multicomponent macrocycles embody the advantage of precisely positioning the structural units to achieve efficient communication between them. However, the construction of a functionalizable macrocycle for ultrafast charge separation and stabilization has not been attempted. Herein, we report the synthesis, crystal structure, and transient absorption of a new functionalizable macrocycle consisting of an oligothiophene-ring-strapped perylene bisimide. Transient absorption results point to a sequential improvement in charge separation and stabilization from the macrocycle to the corresponding linear dimer and 2D polymer due to the unique design. Our macrocycle design with a supportive spatial arrangement of the donor and acceptor units will inspire the development of more complex synthetic systems with exciting electron-transfer and charge-separation features.

Aesthetic designs from nature enable new knowledge to be gained and, at the same time, inspire scientific models. In this context, multicomponent macrocycles embody the advantage of precisely positioning the structural units to achieve efficient communication between them. However, the construction of a functionalizable macrocycle for ultrafast charge separation and stabilization has not been attempted. Herein, we report the synthesis, crystal structure, and transient absorption of a new functionalizable macrocycle consisting of an oligothiophene-ring-strapped perylene bisimide. Transient absorption results point to a sequential improvement in charge separation and stabilization from the macrocycle to the corresponding linear dimer and 2D polymer due to the unique design. Our macrocycle design with a supportive spatial arrangement of the donor and acceptor units will inspire the development of more complex synthetic systems with exciting electron-transfer and charge-separation features.

Although the atroposelective synthesis of biaryls and related compounds bearing axially chiral C-C bonds are well-known, the synthesis of axially chiral C-N bond-containing compounds are relatively less explored, and the construction of axially chiral N-N bonds has received only scant attention. Demonstrated herein is the N-heterocyclic carbene (NHC)-catalyzed selective amidation reaction leading to the atroposelective synthesis of N-N axially chiral 3-amino quinazolinones. The NHC-catalyzed reaction of quinazolinones containing a free N-H moiety with -unsaturated aldehydes under oxidative conditions furnished the atropisomeric quinazolinone derivatives under mild conditions and broad scope. Preliminary studies on experimental and DFT-based N-N rotational barrier determination is also presented.

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Fused pyrimidine derivativesFused pyrimidine derivatives R 0515 A Novel Three-Component Reaction for the Diastereoselective Synthesis of 2H-Pyrimido[2,1-a]isoquinolines via 1,4-Dipolar Cycloaddition. -The 1,4-dipole derived from isoquinoline and alkyne (II) reacts with various N-tosylimines to give title compounds in a diastereoselective manner. -(NAIR*, V.; SREEKANTH, A. R.; ABHILASH, N.; BHADBHADE, M. M.; GONNADE, R. C.;

The copper‐catalyzed oxidative azide‐olefin cycloaddition (OAOC) reaction of differently substituted α,β‐unsaturated carbonyls with azides provided an efficient method for preparing biologically active 1,4,5‐trisubstituted 1,2,3‐triazoles. In this study, the cycloaddition reaction was found to be a simple and powerful method for constructing diverse mono‐ and bis‐(1,4,5‐trisubstituted 1,2,3‐triazole) functionalized heterocyclic compounds in moderate to high yields with great regioselectivity. The XRD‐analysis data of one of the bis‐triazole derivatives supported the regioselectivity as well as the conformity of the method in the construction of the triazole nucleus. The preliminary antifungal profile against C. albicans was observed with cinnamaldehyde‐based triazole derivatives demonstrating promising results.

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