Table 1.

Chemical structures and yields obtained for the synthesis of series 11a–n ^a.

	Compound	Yield b (%)		Compound	Yield b (%)
	11a	78		11h	84
	11b	82		11i	77
	11c	80		11j	78
	11d	58		11k	85
	11e	70		11l	77
	11f	73		11m	81
	11g	69		11n	84

^a Reaction time is 10 min, except for 11k, 11l and 11m (6 min). ^b Isolated yield.