Jp. Dulcere et al., NEW TRIETHYLAMINE INDUCED CARBOCYCLIZATION OF BETA-BROMOPROPARGYL ETHERS IN THE PYRIMIDINEDIONE SERIES, Synlett, (7), 1995, pp. 705-706
Et(3)N promoted carbocyclization of beta-bromopropargyl ethers 2, deri
ved from thymine derivatives 1, affords 3-alkylidene tetrahydrofurans
3 and 4 in good yields.