These are hits copied straight from beilstein, cos I can't be bothered to format them or owt - your dodgy looking compound can certainly be made though! Enjoy....
Ref. 1 39383; 1988/06/27; Journal; Allenstein,E.; Beyl,V.; CHBEAM; Chem. Ber.; GE; 100; 1967; 3551-3563.
Ref. 1 69945; 1988/06/27; Journal; Noe,E.A.; Raban,M.; JACSAT; J. Am. Chem. Soc.; EN; 97; 20; 1975; 5811-5820.
Ref. 1 5596104; 1992/12/31; Journal; Kashima, Choji; Harada, Kaori; Hosomi, Akira; HTCYAM; Heterocycles; EN; 33; 1; 1992; 385-390.
Ref. 1 5504311; 1990/12/31; Journal; Yinglin, Han; Hongwen, Hu; SYNTBF; Synthesis; EN; 2; 1990; 122-124.
Ref. 1 4186818; 1988/06/27; Patent; Bayer AG; DE 2335691; 1975; Chem.Abstr.; EN; 82; 155413.
Ref. 1 1255213; 1988/06/27; Journal; Ray et al.; JOCEAH; J. Org. Chem.; 21; 1956; 1052.