Table 2.

Survey of the fluoride sources for the macrocyclization^a

entry	fluoride source	solvent	equiv	yield, % 8a+8a'	ratiob8a+8a'
1	TMAF•4H2O	DMF	5	47	100:0
2	TMAF•6H2O	DMF	5	34	100:0
3	BTMAF	DMF	5	39	2:1
4	BTMAF•6H2O	DMF	5	49	6:1
5	BTMAF•10H2O	DMF	5	0	-
6	TEAF•2H2O	DMF	5	32	2:1
7	TEAF•6H2O	DMF	5	40	2:1
8	TBAT	THF	5	29	100:0
9	TASF	THF	5	22	100:0
10	CsF	DMF	5	0	-

^aReaction conditions employed 0.25 mmol of 7 at 0.1 M.

^bRatio determined by ¹H NMR.