... 1982, 641. (17) Griffin, T. S.; Woods, T. S.; Klayman, DL Adu. Heterocycl. Chem. 1975,18, 99. Page 4. 2266 J. Org. Chem., Vol. 53, No. 10, 1988 Sugimoto et al. organic layer was separated, dried, and concentrated in vacuo followed by chromatography with ether as the eluant. ...