... Chem. Soc. Jpn. 2005, 78: 1659; 7a Molina P. Fresneda P. Synthesis 1989, 878; 7b Bonini C. Funicello M. Spagnolo P. Synlett 2006, 1574; 8a Tahri A. Buysens KJ. ... 13b Achab S. Guyot M. Potier P. Tetrahedron Lett. 1993, 34: 2127; 14 Iwaki T. Yasuhara A. Sakamoto TJ Chem. ...