A mild and concise [3+2] coupling of quinone monoacetals or quinone imine ketals with vinylcarbamates promoted by Lewis acid was realized. Various 2-carbamate-2,3-dihydrobenzofurans and 2-carbamate-indolines have been prepared in moderate to good yields.
Key words
[3+2] coupling - Lewis acid - synthesis - 2-carbamate-2,3-dihydrobenzofurans - 2-carbamate-indolines