Bp. Pradhan et al., STUDIES ON THE REACTIONS OF N-BROMOSUCCINIMIDE IN DIMETHYL-SULFOXIDE .8. ACTION ON CERIN AND CERIN ACETATE, Indian journal of chemistry. Sect. B: organic chemistry, including medical chemistry, 34(3), 1995, pp. 178-182
Cerin (1) on oxidation with NBS in DMSO furnishes two compounds which
have been identified as 1,1-dibromo-2-keto friedel-3(4)-en-3-ol (3) an
d friedel-1,3-dien-2,3-diol (4) whereas cerin acetate (2) affords 23-b
romo-2-acetoxy friedel-1(2),4(23)-dien-3-one (5) and 2 alpha-O-acetoxy
-friedel-3(4)-en-3-hypobromite(6).