Steroid α-Naphthylurethans

Palladium‐Catalyzed Carbonylation of Amines: Switchable Approaches to Carbamates and N,N′‐Disubstituted Ureas

“…Final-ly, we were pleased to observe that 4a was obtained in 93% yield in 1,4-dioxane in the absence of MeOH (Table 1, entry 13). Other solvents were found to be less effective than 1,4-dioxane toward N,N'-diphenyl-A C H T U N G T R E N N U N G urea 4a (Table 1, entries [14][15][16].…”

“…Next, the carbonylation reactions of p-toluidine 1e with other alcohols were also examined. Although tert-butyl alcohol appeared to be unsuitable in this process (3t), the desired carbamates 3p-3s were obtained in moderate yields when ethanol, 2-propanol, benzyl alcohol, or allyl alcohol were employed ( Table 2, entries [16][17][18][19][20].…”