Table 4.

One-pot MW-assisted synthesis of a set of urea derivatives.^a

entry	R–Br	R–NH2	product	yieldb (%)
1	17	22	27	98
2	17	23	28	98
3	17	24	29	98
4	18	22	10	97
5	18	23	30	94
6	18	24	31	98
7	18	25	32	98
8	18	26	33	98
9	19	22	34	89
10	19	23	35	89
11	19	24	36	88
12c	20	3	37	85
13c	21	3	38	83

^aReactions were carried out in a MW reactor: alkyl bromide, NaN₃ (2 equiv), MeCN, 95 °C, 3 h ; then PS-PPh₂ (1.5 equiv), CO₂ (14.5 bar), amine (2 equiv), at 50 °C 1.5 h then 70 °C 3 h. ^bIsolated yield. ^cR–N₃ was synthesized in DMF and MeCN was then added.