2,4,8,10-tetraoxa-3,9-dithiaspiro[5.5]undecane 3,9-dioxide

2,4,8,10-tetraoxa-3,9-dithiaspiro[5.5]undecane 3,9-dioxide is a bis(spiro) derivative containing two dioxaphosphorinane 2-oxide groupings. Following the rationale that single-ring systems (2-alkylamino and 2-arylamino-5-alkyl-5-nitro-1,3,2-dioxaphosphorinane 2-oxides) exhibit antitumor activity against Walker carcinosarcoma 256, this spiro compound is expected to possess equal or greater antitumor activity than the single-ring systems due to its dual-ring structure.^[1]

[1] Billman, J. H., & May, R. F. (1968). 1,3,2-Dioxaphosphorinane 2-Oxides III. Preparation and Antitumor Evaluation of Some 3,9-Disubstituted-2,4,8,10-Tetraoxa-3,9-Diphosphaspiro[5.5]-Undecane 3,9-Dioxide. Journal of Pharmaceutical Sciences, 57 10, Pages 1812-1814. https://doi.org/10.1002/jps.2600571047