S. Shashikanth et C. Anjanamurthy, SYNTHESIS OF PODOPHYLLOTOXIN AND RELATED ANALOGS .9. SYNTHESIS OF ETHYLENEDIOXY AND INDAN ANALOGS OF PICROPODOPHYLLONE AND THEIR ANTIMITOTIC ACTIVITY, Indian Journal of Heterocyclic Chemistry, 5(3), 1996, pp. 185-188
Furo [3',4' : 6,7]-naphtho [2,3-e]-1, 4-dioxin-7-one-6, 6a-tetrahydro-
10-one-6-phenyl (9) and furo [3', 4',:6, 7]-naphtho [2,3-d]-2,3-cyclop
entenyl-6-one-5, 5a, 8, 8a-tetrahydro-9-one-5-phenyl (10) have been sy
nthesised by bishydroxymethylation of tetralone acids (5 & 6) using fo
rmaldehyde in alkali followed by Jones oxidation using chromium trioxi
de in sulphuric acid.