Substrate scope for the formation of various O-acylhydroxamates 3^a.

Entry	R	R1	Yield of 3b (%)
1	Ph	Ph	3a, 80
2	4-MeC6H4	Ph	3b, 74
3	4-BrC6H4	Ph	3c, 76
4	2-Furyl	Ph	3d, 70
5	2-Naphthyl	Ph	3e, 76
6	Cy	Ph	3f, 69
7	Ph	4-MeC6H4	3g, 68
8	Ph	4-MeOC6H4	3h, 66
9	Ph	4-tBuC6H4	3i, 64
10	Ph	3,5-Di-Me-C6H3	3j, 67
11	Ph	4-FC6H4	3k, 74
12	Ph	4-ClC6H4	3l, 70
13	Ph	2-BrC6H4	3m, 67
14	Ph	3-BrC6H4	3n, 67
15	Ph	4-BrC6H4	3o, 70
16	Ph	4-CF3C6H4	3p, 62
17	Ph	2-Thienyl	3q, 74
18	Ph	2-Naphthyl	3r, 71
19	Ph	2-Styryl	3s, 70
20	Ph	Cy	3t, 69
21	Ph		3u, 64

^aReaction conditions: oxime chloride 1 (0.22 mmol), carboxylic acid 2 (0.2 mmol), DABCO (0.22 mmol), dioxane (1 mL), at room temperature for 12 h.

^bIsolated yield.