It has been reported that 2-naphthyl allylic ethers undergo the Claisen rearrangement to give naphthol derivatives. 2-naphthyl propargyl ether derivatives, _??_^{-O·CH₂C≡C-R} (R=H, CH₃, Ph.), replacing the double bond of allylic ethers by a triple bond, do not undergo the Claisen rearrangement but a new ring-closure to give 3H-naphtho [2, 1-b] pyran derivatives. Moreover, 1-naphthyl derivatives, _??_^{O·CH₂C≡C-Ph}also undergo the same ring-closure to give 4-phenyl-2H-naphtho [1, 2-b] pyran. The structures of new pyran derivatives obtained by the new ring-closure were confirmed by the melting point, infrared and ultraviolet spectra of the authentic samples which were synthesized by another routes.