Table 1.

Structures and yields of compounds 5–25.

Compound	R	m.p. (°C)	Yields (%) a
5		171–173	51
6		171–173	57
7		185–186	68
8		174–176	83
9		176–178	81
10		179–181	83
11		186–188	79
12		180–182	76
13		178–180	82
14		187–189	81
15		156–158	91
16		161–163	86
17		188–190	82
18		202–204	70
19		192–193	84
20		194–196	75
21		198–200	83
22		181–183	85
23		204–206	77
24		184–186	82
25		135–137	86

^a Yields represent isolated yields.