2-fluoro-9-fluorenone hydrazone 在
manganese dioxide 作用下,
以
四氢呋喃 为溶剂,
反应 18.0h,
以to provide 6.5 g (100%) of product (13) as a red solid which的产率得到2-fluoro-9-diazofluorene
参考文献:
名称:
Spirofluoreneisothiazolidinone dioxides as aldose reductase inhibitors
Synthesis of substituted fluorenones and substituted 3',3'-dichlorospiro[fluorene-9,2'-thiiranes] and their reactivities
摘要:
Several novel 9-fluorenones were synthesized and were used as precursors in an attempt to prepare unique substituted 3',3'-dichlorospiro[fluorene-9,2'-thiiranes]. Several of the thiiranes were unstable and desulfurized during their preparation (7a-d,11,12). 3',3'-Dichloro(2,5-dimethoxyspiro[fluorene-9,2'-thiirane] (7f) was prepared along with 2,2-dichloro-3,3-bis(4-methoxyphenyl)thiirane (16), and 3',3'-dichloro-10,11-dihydrospiro[5H-dibenzo[a,d]cycloheptane-5,2'-thiirane] (17) all of which were stable at room temperature. A study of the reactivity of fluorenyl-substituted thiiranes and other related thiiranes showed that the extent of aromaticity of the substituents at the 3-position of the thiiranes influences their stabilities.
Spiro[fluoreneisothiazolidin]one dioxides: new aldose reductase and L-hexonate dehydrogenase inhibitors
作者:Mark T. DuPriest、Brenda W. Griffin、Daniel Kuzmich、Loretta G. McNatt
DOI:10.1021/jm00115a011
日期:1991.11
The first examples of spiro[fluorene-9,4'- and -9,5'-isothiazolidin]one dioxides (1 and 2) were synthesized and screened for activity as aldose reductase and L-hexonate dehydrogenase inhibitors. Compared to compounds 1, and 9,5'-compounds 2, synthesized from fluorene-9-sulfonamides by alkylation at C(9) with ethyl bromoacetate followed by cyclization, were more active, but relatively nonselective, inhibitors of aldose reductase and L-hexonate dehydrogenase, with IC50 values for in vitro inhibition of both enzymes on the order of 10(-7)-10(-8) M. However, the isomeric 9,4'-compounds 1, prepared by alkylation of fluorene-9-carboxylic acid esters with bromo- or iodo-methanesulfonamide followed by cyclization, were more selective inhibitors Of L-hexonate dehydrogenase with IC50 values of about 10(-6) M.