Table 2.
Entry | 1 | 2 | Time (h) | 3/4 Yield (%) Cat. = SZ |
3/4 Yield (%) Cat. = SZ/MCM-41 |
---|---|---|---|---|---|
1 | 2a | 0.5 | 74/0 | 23/0 | |
2 [41,42]* | 2a | 5 | 61/20 | 63/0 | |
3 [43] | 2b | 6 | 82/0 | 35/0 | |
4* | 2a | 5 | 63/13 | 55/0 | |
5 | 2b | 5 | 81/0 | 54/0 | |
6 [44,45(b,c)] | 2a | 5 | 97/0 | 84/0 | |
7 | 2b | 5 | 71/0 | 14/0 | |
8 [45] | 2a | 5 | 93/0 | 99/0 | |
9 | 2b | 5 | 83/0 | 45/0 | |
10 [46](d), 45(c), 42]* | 2a | 1 | 0/96 | 5/91 | |
11 [41,47] | 2b | 6 | 53/31 | 55/25 | |
12 [41] | 2a | 5 | 81/0 | 83/0 | |
13 | 2b | 5 | 87/0 | 81/0 | |
14 [41, 46] | 2a | 0.5 | 86/0 | 81/0 | |
15 [41] | 2b | 0.5 | 87/0 | 52/0 | |
16 | 2a | 1 | 76/0 | 57/0 | |
17 | 2b | 1 | 77/0 | 51/0 | |
18 | 2a | 1 | 76/0 | 59/0 | |
19 [48] | 2b | 1 | 85/0 | 82/0 |
Yields of the isolated possible products 3 or 4 shown in Scheme 1; the regioselectivity was evaluated by GC-MS; * the structures of the minor products in entries 2, 4 and 10 were determined by CI mode GC-MS.