Table 3.
Entry | Alkyne | Azide | Product | Yield b % (Conv. c) |
---|---|---|---|---|
1 d | 2a |
1b |
3b |
98 (>99) |
2 d | 2a |
1c |
3c |
97 (>99) |
3 | 2a |
1d |
3d |
95 (>99) |
4 d | 2a |
1e |
3e |
91 (95) |
4 d | 2a |
1f |
3f |
94 (97) |
5 d | 2a |
1g |
3g |
97 (>99) |
6 | 2a |
1h |
3h |
90 (92) |
7 d |
2b |
1i |
3i |
98 (>99) |
8 |
2c |
1a |
3j |
92 (96) |
9 |
2d |
1a |
3k |
88 (91) |
10 e |
2e |
1a |
3l |
98 (>99) |
11 f | 2a |
1j |
3m |
81 |
a: Reaction conditions: azide 1 (1 mmol), alkyne 2 (1 mmol), Cu powder (1 mmol), 5 min, 650 rpm; stainless steel jar (50 mL), 1500 small balls and 48 medium balls; b: Isolated yield, compound purity proved by 1H-NMR and 13C-NMR (see Supporting Info); c: Determined by GC-MS; d: Reaction time 10 min; e: Excess 1a (2 mmol); f: Reaction condition: 0.1 mmol 1j (6-monoazido-β-CD) (0.1 mmol), 2a (0.5 mmol), Cu powder (0.1 mmol), 30 min.