... Complete cyclization was not achieved even after (18) March, J. In Advanced Organic Chemistry, 3rd ed.; John Wiley & Sons: New York, 1985; p 372. (19) Fieser, L.; Fieser, M. In Reagents for Organic Synthesis; John Wiley & Sons: New York, 1967; Vol. ... Page 4. 2886 J. Org. ...