摘要:
The present invention relates to a method for preparing a compound T having a thioether group from a compound D having a disulfide group in the presence of a carbene.
摘要:
The invention encompasses processes for preparing intermediates, such as (R)-modafinic acid and its C1-2 alkyl ester, and the conversion of the intermediates into armodafinil. In particular, the invention concerns: (i) a process for the optical resolution of modafinic acid with (R)-α-naphthylethylamine and its conversion into armodafinil; (ii) (R)-modafinic acid containing less than 2% area by HPLC of (S)-modifinic acid; (iii) a process for the preparation of C1-2 alkyl ester of (R)-modafinic acid from (R)-modafinic acid by reaction with methanol or ethanol in the presence of at least one acidic reagent and its conversion into armodafinil; (iv) armodafinil with less than 0.5% area by HPLC of (S)-modafinil entantiomer, a pharmaceutical composition containing it and process for the preparation of this composition; (v) armodafinil with less than 0.1% area by HPLC of modafinic acid, a pharmaceutical composition containing it and process for the preparation of this composition; (vi) a process for the reduction of modafinic acid content in armodafjnil by contacting a solution with activated basic or neutral alumina; (vii) armodafinil with less than 0.2% area by HPLC of bis(diphenylmethyl) disulphide (R-MDF-DS), a pharmaceutical composition containing it and process for the preparation of this composition; (viii) a process for the preparation of R-MDF-DS from diphenylmethanethiol acetate; and (ix) a process for the reduction of R-MDF-DS content in armodafinil by suspending it in a C5-10 hydrocarbon.
摘要:
(E)-styryl benzylsulfones of formula (I) are useful as anticancer agents wherein R1, R2, R3, and R4 are independently selected from the group consisting of hydrogen, fluoro, chloro, iodo, bromo, C1-C6 alkyl, C1-C4 alkoxy, nitro, cyano and trifluoromethyl, with the proviso that (a) R1, R2, and R3 not all hydrogen when R4 is 2-chloro or 4-chloro; (b) when R1 and R3 are hydrogen and R2 is 4-bromo or 4-chloro, then R4 may not be 4-chloro, 4-fluoro or 4-bromo; (c) when R1 and R3 are hydrogen and R2 is 4-fluoro, then R4 may not be 4-fluoro or 4-bromo; (d) when R1 is hydrogen, and R4 is 2-fluoro, the R2 and R3 may not be 4-fluoro; and (e) when R1 is hydrogen and R3 is 4-hydrogen, 4-chloro, 4-bromo, 4-methyl or 4-methoxy, and R4 is 2-hydrogen, 2-chloro, or 2-fluoro; then R2 may not be 4-hydrogen, 4-chloro, 4-fluoro, or 4-bromo.
摘要:
The invention relates to new conjugated mono-, oligo- and polyalkylidenefluorenes. The invention further relates to methods for their preparation, their use as semiconductors or charge transport materials in optical, electrooptical or electronic devices including field effect transistors, electroluminescent, photovoltaic and sensor devices. The invention further relates to field effect transistors and semiconducting components comprising the new mono-, oligo- and polymers.
摘要:
Disclosed are a diethylenicallyunsaturated monomer represented by the following formula [Ia]: wherein n is an integer of from 1 to 10, and a and b each represent 0 or an integer of from 1 to 4, and an optical resin which is substantially insoluble and infusible and has a refractive index η D of at least 1.62, and which is obtained by polymerizing a monomer comprising 50 to 100% by weight of this diethylenically unsaturated monomer.