Vu, Nguyen Quang; Dujardin, Gilles; Collet, Sylvain C.; Raiber, Eun-Ang; Guingant, Andre Y.; Evain, Michel Tetrahedron Letters, 2005, vol. 46, # 45 p. 7669 - 7673 doi: 10.1016/j.tetlet.2005.09.053