Sulfur
Recent Literature
The reaction of 4-nitro-1,3-diarylbutan-1-ones and ammonium acetate in the
presence of morpholine and sulfur provides the corresponding 2,4-diarylpyrroles
in excellent yields.
M. Adib, N. Ayashi, F. Heidari, P. Mirzaei,
Synlett, 2016, 27, 1738-1742.
The combination of sulfur and DABCO efficiently promotes a reductive coupling/annulation
of o-nitrophenols or o-nitroanilines with benzaldehydes. This
method represents a simple, straightforward, and green approach to the
construction of benzoxazoles and benzimidazoles.
M.-H. D. Dang, L. H. T. Nguyen, P. H. Tran, Synthesis, 2020, 52,
1687-1694.
The
condensation of 2-nitrobenzyl alcohols with arylacetic acids provides substituted quinazolines
under mild conditions in the presence of urea as a nitrogen source, elemental sulfur as a promoter,
DABCO as a base, and DMSO as a solvent. The reaction tolerates functionalities such as chloro, fluoro,
trifluoromethyl, thienyl, and indolyl groups.
K. X. Nguyen, D. K. Nguyen, P. H. Pham, H. V. Le, T. T. Nguyen, N. T. S. Phan, Synlett, 2020,
31,
1112-1116.
