Total Synthesis and Comparative Analysis of Orlistat, Valilactone, and a Transposed Orlistat Derivative: Inhibitors of Fatty Acid Synthase
摘要:
Concise syntheses of orlistat ( Xenical), a two-carbon transposed orlistat derivative, and valilactone are described that employ the tandem Mukaiyama aldol-lactonization (TMAL) process as a key step. This process allows facile modification of the alpha-side chain. Versatile strategies for modifying the delta-side chain are described, involving cuprate addition and olefin metathesis. Comparative antagonistic activity of these derivatives toward a recombinant form of the thioesterase domain of fatty acid synthase is reported along with comparative activity-based profiling.
Silica–ferric chloride (SiO2–FeCl3) catalyzed selective synthesis of 2-substituted benzimidazole through <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mrow><mml:msub><mml:mrow><mml:mtext>C</mml:mtext></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mtext>sp</mml:mtext></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:msub><mml:mtext /><mml:msub><mml:mrow><mml:mtext>C</mml:mtext></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mtext>sp</mml:mtext></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:msub></mml:mrow></mml:math> bond cleavage of β-ketoester/amide
作者:Swapan Majumdar、Ankita Chakraborty、Subrata Bhattacharjee、Sudipto Debnath、Dilip K. Maiti
DOI:10.1016/j.tetlet.2016.08.099
日期:2016.10
Silica–ferric chloride (SiO2–FeCl3) supported reagent was successfully utilized as recyclable catalyst for the general and highly efficient synthesis of 2-substitutedbenzimidazole by the condensation of 1,2-diamino benzene and β-ketoester/amide followed by original Csp2Csp3 bond cleavage. Evidences in favor of CC (α–β) bond cleavage of β-ketoesters/amides are established.
Synthesis of 4-Alkyl- and 4-(ω-Chloroalkyl)-3-hydroxy-5-alkylidenebutenolides Based On Cyclizations of 4-Alkyl- and 4-(ω-Chloroalkyl)-1,3-bis(trimethylsilyloxy)buta-1,3-dienes with Oxalyl Chloride
4-Alkyl- and 4-(ω-chloroalkyl)-1,3-bis(trimethylsilyloxy)buta-1,3-dienes were prepared from ethyl acetoacetate in three steps. Their cyclization with oxalyl chloride allowed an efficient synthesis of 4-alkyl- and 4-(ω-chloroalkyl)-5-alkylidenebutenolides.
3-Hydroxy-2-alkyl carboxylic acids related to mycolic acid
作者:Walter J. Gensler、Iftekhar Alam、R.S. Prasad、A.I. Radhakrishna、A.P. Chaudhuri
DOI:10.1016/0040-4020(79)88026-6
日期:1979.1
A series of long-chain 3-hydroxy-2-alkylacids structurally analogous to mycolicacids are reported. The synthesis applied, making use of 3-keto esters as intermediates, permits the insertion of 2-alkyl groups having no structural relationship to the main acid chain.
Self-Assembled Pentamers and Hexamers Linked through Quadruple-Hydrogen-Bonded 2-Ureido-4[1H]-Pyrimidinones
作者:Henk M. Keizer、Juan J. González、Margarita Segura、Pilar Prados、Rint P. Sijbesma、E. W. Meijer、Javier de Mendoza
DOI:10.1002/chem.200500329
日期:2005.8.5
The preorganization of bifunctional 2-ureido-4-pyrimidinones mediated by either 1,3-substituted adamantane or meta-substituted phenylene ring linkers leads to the preferred formation of stable pentameric (1)(5) and hexameric (2)(6) assemblies, respectively. Despite the high binding constant of the 2-ureido-4-pyrimidinone dimers and the highly preorganized structure of the monomer, the predominant formation
3-Acyltetramic acids having various substituents at the 1-and 5-positions, and possessing a tricarbonylmethane structure, were synthesized and tested for antimicrobial activity to investigate the structure-activity relationships. It was found that the nature of the substituents at the 1-and 5-positions as well as the 3-position is an important factor for activity to inhibit the growth of Bacillus subtillis and Staphylococcus aureus.