Hisamatsu Yosuke, Shirai Naohiro, Ikeda Shin-ichi, Odashima Kazunori
Sagami Chemical Research Center, Hayakawa, Ayase 252-1193, Japan.
Org Lett. 2009 Oct 1;11(19):4342-5. doi: 10.1021/ol9017084.
A new DDAA hydrogen-bonding module (UImp-2), based on a ureidoimidazo[1,2-a]pyrimidine structure, forms a highly stable homodimer (K(dim) > 1.1 x 10(5) M(-1) in CDCl(3)) without competition from undesired hydrogen-bonded dimers.