A HIGHLY PRACTICAL ROUTE TO 2-METHYLCHROMONES FROM 2-ACETOXYBENZOIC ACIDS
摘要:
2-Methylchromones were accessed via a keto ester condensation on 2-acetoxybenzoyl chloride, followed by cyclization and decarboxylation. No column chromatography was required in the process.
zol-2-yl)-4H-1-benzopyran-4-ones 4 is described starting from 2-acetoxybenzoyl chlorides and 1,2-dimethylimidazole. Chromones 4 undergo alkaline ring opening to the corresponding 1-(2-hydroxyphenyl)-2-(1-methyl-1H-imidazol-2-yl)ethenols 5 which give ring closure to 2-substituted 3-(1-methyl-1H-imidazol-2-yl)-4H-1-benzopyran-4-ones or 2,3-dihydro-3-(1-methyl-1H-imidazol-2-yl)-4H-1-benzopyran-4-ones
2-甲基-3-(1-甲基- 1的合成ħ咪唑-2-基)-4- ħ -1-苯并吡喃-4-酮4中描述了从2-乙酰氧基苯甲酰基氯化物和1,2-二甲基咪唑开始。染色体4对相应的1-(2-羟苯基)-2-(1-甲基-1 H-咪唑-2-基)乙烯醇5进行碱性开环,这些环使2取代的3-(1-甲基- 1 H-咪唑-2-基)-4 H -1-苯并吡喃-4-酮或2,3-二氢-3-(1-甲基-1 H-咪唑-2-基)-4 H -1-苯并吡喃-4-ones。可以从色酮4容易地获得相应的色醇和色烯。
Synthesis of 2-Fluoro-1,4-benzoxazines and 2-Fluoro-1,4-benzoxazepin-5-ones by Exploring the Nucleophilic Vinylic Substitution (S<sub>N</sub>V) Reaction of <i>gem</i>-Difluoroenamides
作者:Tamara Meiresonne、Guido Verniest、Norbert De Kimpe、Sven Mangelinckx
DOI:10.1021/acs.joc.5b00507
日期:2015.5.15
novel structural units which have been explored as precursors in heterocyclic synthesis. The presence of two fluorine atoms at the β-position of the enamide moiety endows unique electrophilic reactivity. Treatment of these enamides with oxygen nucleophiles gives rise to a nucleophilicvinylicsubstitution (SNV) reaction, which was directed toward 2-fluoro-1,4-benzoxazines and 2-fluoro-1,4-benzoxazepin-5-ones
N-ACYL ANTHRANILIC ACID DERIVATIVE OR SALT THEREOF
申请人:Yokotani Junichi
公开号:US20110275797A1
公开(公告)日:2011-11-10
An N-acyl anthranilic acid derivative represented by general formula (1) or a salt thereof is useful for prevention or treatment of diseases associated with excessive production of collagen. (In the formula, R
1
represents a carboxyl group or the like; R
2
represents a hydrogen atom or the like; R
3
represents an optionally substituted aryl group or the like; X
1
represents a carbonyl group; X
2
represents a bonding hand; X
3
represents a bonding hand; X
4
represents a bonding hand or the like; and A represents an optionally substituted phenyl group or the like.)
Compounds and compositions for delivering active agents
申请人:——
公开号:US20030216589A1
公开(公告)日:2003-11-20
Amino acid derivative as carrier compounds and compositions which are useful in the delivery of active agents are provided. The active agents can be a peptide, mucopolysaccharide, carbohydrate, or lipid. Methods of administration, including oral administration, and preparation are provided as well.
A series of seven chiral, tripodalN,O,S and N,N,Oligands were prepared in which N stands for a secondary amine or imidazole donor, O for a phenol, and S for a thioether or thiol metal-binding group. Key steps are (1) the construction of ortho-hydroxyacetophenones bearing the phenolic binding group and either a thioether, a protected thiol or an imidazole substituent in the α-position, and (2) subsequent