Chemistry Letters, Vol.30, No.8, 758-759, 2001
Reaction of 3,4-di-t-butylthiophene 1-oxide with 2-methylene-1,3-dimethylimidazolidine: Methylene transfer and [4+4] dimerization
The reaction of 3,4-di-t-butylthiophene 1-oxide (1) with 2-methylene-1,3-dimethylimidazolidine (2) gave 4,4a-di(t-butyl)-1a,4a-dihydro-1H-cyclopropa[b]thiophene and 1,3-dimethyl-2-imidazolidinone through a methylene transfer from 2 to 1, in addition to a [4+4] cyclodimerization product of 1.