Reaction of 1-oxo-3-dialkylamino-1 H-naphtho[2,1-b]pyrans with N,N-dimethylformamide in the presence of phosphorus oxychloride afforded the corresponding 1-oxo-2-formyl-3-dialkyl-amino-1H-naphtho[2,1-b]pyrans.
1-氧代-3-二烷基氨基-1 H-萘并[2,1- b ]吡喃与N,N-二甲基甲酰胺在三氯氧磷存在下反应,得到相应的1-氧代-2-甲酰基-3-二烷基-氨基-1 H-萘并[2,1 -b ]吡喃。