Rearrangements of 3-heterobicyclo[3.2.0]hept-6-enes
作者:Arthur G. Schultz、Theodore H. Fedynyshyn
DOI:10.1016/0040-4020(82)80247-0
日期:1982.1
effect cyclobutene ring opening in the 3-heterobicyclo[3.2.0]hept-6-ene ring system. We report the unexpected rearrangement of 4a, 4b, 13b and 13c to the synthetically useful a-vinyl-2,5-dihydrothiophenes 7a, 7b, 15a and 15b, respectively. Conversion of 4a to 6 is suggested to occur by a 1,3-rearrangement of 4a to isomeric 3-thiabicyclo[3.2.0]hept-6-ene 19 followed by cyclobutene ring opening in 19