DTBB-Catalyzed Lithiation of 4-Hetero-substituted Dibenzothiins
作者:Miguel Yus、Francisco Foubelo、José V. Ferrández
DOI:10.1246/cl.2002.726
日期:2002.7
The DTBB-catalyzed lithiation of 4-hetero-substituted dibenzothiins (phenoxathiin, phenothiazine, and thianthrene) gives the corresponding functionalized organolithium intermediates, which by reaction with different electrophiles afford the expected functionalized thiols. The cyclization of some alcohol compound derivatives gives the corresponding homologous seven-membered dibenzo heterocycles.
Dibenzothiepins, phthalans and phthalides from 4-heterosubstituted dibenzothiins
作者:Miguel Yus、Francisco Foubelo、José V Ferrández
DOI:10.1016/s0040-4020(03)00210-2
日期:2003.3
thiols 2 under acidic conditions leads to the corresponding seven-membered dibenzo heterocycles 5. In the case of thianthrene 1c, after addition of a carbonyl compound as the first electrophile [MeCHO, ButCHO, Me2CO, Et2CO, (CH2)5CO], the corresponding intermediate II can be lithiated again and react with a second electrophile. Diols 3 are obtained after hydrolysis when a carbonyl compound [ButCHO, PhCHO