[EN] BORONIC ESTER PRODRUGS AND USES THEREOF<br/>[FR] PROMÉDICAMENTS D'ESTER BORONIQUE ET LEURS UTILISATIONS
申请人:MASSACHUSETTS INST TECHNOLOGY
公开号:WO2020236253A1
公开(公告)日:2020-11-26
Disclosed herein are compounds of Formula (I) or (II). The compounds include an agent (e.g., pharmaceutical agent, cosmetic agent, or nutraceutical agent) through a linker that includes a boronic ester moiety in the backbone of the linker. The compounds may be monomers. Also provided are polymers prepared by polymerizing the monomers. The polymers may be useful for delivering the agent to a subject, tissue, biological sample, or a cell. Also provided are methods of preparing the polymers, compositions and kits comprising the polymers, and methods of use (e.g., use in delivering the agent, treating a disease, preventing a disease, diagnosing a disease) involving the polymers or compositions. The structure of the boronic ester moiety may be fine tuned so that the properties related to delivery to a subject, biological sample, tissue, or cell may be fine tuned.
and characterisation of a new highly active Hoveyda–Grubbs 2nd generation type catalyst is described. Substitution of one chloride ligand with a partially fluorinated trialkoxysilyl substituted carboxylate leads to the stable monocarboxylate ruthenium catalyst (3). This catalyst represents the first example of a stable and isolable mono-chloride exchanged carboxylatecomplex suitable for both homogeneous
Structural Studies on Cycloadducts of Furan, 2-Methoxyfuran, and 5-Trimethylsilylcyclopentadiene with Maleic Anhydride and <i>N</i>-Methylmaleimide
作者:Yit Wooi Goh、Brett R. Pool、Jonathan M. White
DOI:10.1021/jo7018575
日期:2008.1.1
of the C−C bonds that break in this reaction is clearly related to the known reactivity of these cycloadducts toward this reaction. In the structures of the cycloadducts 21 and 22 derived from 2-methoxyfuran, the early stages of an alternative fragmentation reaction are apparent, consistent with the reactivity of these compounds in solution.
Unusual stability of N-methylmaleimide cycloadducts: characterization of isobenzofuran retro-Diels-Alder reactions
作者:David Tobia、Roy Harrison、Brian Phillips、Thomas L. White、Marcello DiMare、Bruce Rickborn
DOI:10.1021/jo00076a032
日期:1993.11
Many years ago Diels and Thiele noted the unusual stability of maleic anhydride cycloadducts and employed this feature in scavenging anthracene generated in a retro-[4 + 2] reaction. N-methylmaleimide, although nearly identical to maleic anhydride in rates of Diels-Alder reactions, forms even more stable cycloadducts. The rate constants for the four reactions that characterize the furan/N-methylmaleimide system were measured under the conditions used by Lee and Herndon to study the furan/maleic anhydride system. Comparison of the two dienophiles indicates that N-methylmaleimide adducts are ca. 3 kcal.mol-1 more stable than the corresponding exo- and endo-maleic anhydride adducts. Somewhat larger (ca. 4 +/- 0.5 kcal.mol-1) differences in stability were found for the cycloadducts of the much more reactive diene isobenzofuran. N-Methylmaleimide is used as a diene scavenger to obtain rate constants for retro-Diels-Alder reactions of isobenzofuran adducts with maleic anhydride and some substituted analogs. The rates of retro-Diels-Alder reactions of substituted N-methylmaleimide adducts were also determined by an alternative method. The substituents examined enhance the rates of exo retro-Diels-Alder reactions by factors of 15-40, while endo adduct retro-Diels-Alder rates are only slightly affected. Calculations were done at the MP2/6-31G*//HF/6-31G* level to compare the heats of hydrogenation of maleic anhydride and maleimide. The reduction of maleimide is calculated to be 2.5 kcal.mol-1 more exergonic, supporting the experimental observations.