摘要:
A process for the preparation of alpha-6-deoxytetracyclines from the corresponding 6-methylene tetracyclines is described using a silica-supported heterogeneous rhodium catalyst of general formula (I), wherein R and R' are each selected from hydrogen and C1-C4 alkyl; x is an integer from 1 to 6; Ph is phenyl; y is an integer from 1 to 3; and L is a ligand selected from alkoxysilyl-substituted alkyldiphenyl phosphines. The process stereospecifically produces the alpha epimers at higher yields while using lower rhodium metal levels than prior methods.
摘要:
The present invention concerns neutral sugar derivatives (Formula I) of pradimicins, their use as antifungal agents, methods for their preparation, and intermediates for their synthesis. wherein R¹ is selected from the group consisting of H, methyl, and hydroxymethyl, and when R¹ is methyl or hydroxymethyl, the resulting amino acid residue has the D -configuration; and R² is H or ß- D -xylosyl with the proviso that, when R¹ is methyl, R² is H; or a pharmaceutically acceptable salt thereof.
摘要:
The present invention provides a novel compound that increases KAI1 promoter activity, a pharmaceutically acceptable salt thereof, and a composition for inhibiting cancer metastasis and invasion or treating colorectal cancer containing the same.
摘要:
Described herein are UV-absorbing vinylic monomers and their uses in preparing UV-absorbing contact lenses capable of blocking ultra-violet (“UV”) radiation and violet radiation with wavelengths from 380 nm to 440 nm, thereby protecting eyes to some extent from damages caused by UV radiation and potentially from violet radiation.
摘要:
The present disclosure describes a method of coupling a first compound to a second compound, the method comprising: providing the first compound having a fluorosulfonate substituent; providing the second compound comprising an alkene; and reacting the first compound and the second compound in a reaction mixture, the reaction mixture including a catalyst having at least one group 10 atom, the reaction mixture under conditions effective to couple the first compound to the second compound.
摘要:
Provided is a compound represented by formula (1) or a pharmacologically acceptable salt thereof. (In the formula, A is C 6-10 arylene, etc.; R 1a , R 1b and R 1c each independently is a hydrogen atom, a halogen atom, a C 1-4 alkyl group, a C 1-4 alkoxy group, etc.; R 2 is an optionally substituted C 6-10 aryl group, an optionally substituted 5- to 12-membered monocyclic or polycyclic heteroaryl group, an optionally substituted C 7-16 aralkyl group, etc.; m is 0, etc.; n is an integer of 0 to 2.)
摘要翻译:提供由式(1)表示的化合物或其药理学上可接受的盐。 (式中,A为C 6-10亚芳基等; R 1a,R 1b和R 1c各自独立地为氢原子,卤素原子,C 1-4烷基,C 1-4烷氧基等; R 2为 任选取代的C 6-10芳基,任选取代的5至12元单环或多环杂芳基,任选取代的C 7-16芳烷基等; m为0等; n为0至 2.)