Method for synthesizing chiral oxygen-containing eight-membered ring compound through palladium-catalyzed asymmetric allyl cycloaddition reaction
An allyl ring, addition reaction technology, applied in asymmetric synthesis, organic chemical methods, chemical instruments and methods, etc., can solve the problems of no reports, etc., and achieve convenient and simple operation, high yield, and mild reaction conditions Effect
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Embodiment 1
[0045] (9S,10S)-9-(3,5-Dichlorophenyl)-7-methylene-10-((E)-styryl)-7,8,9,10-tetrahydro-6H- Synthesis of [1,3]bisoxazol[4',5':4,5]benzo[1,2-b]oxooctanoic acid-9-carboxylic acid methyl ester (Ⅲaa)
[0046] The reaction scheme is as follows:
[0047]
[0048] The operation steps are as follows:
[0049] Under nitrogen protection, add Pd to a dry 5 mL reaction vial 2 (dba) 3 · CHCl 3 (0.005mmol, 5.2mg), chiral ligand (0.022mmol, 12.7mg) and 2mL of ethylbenzene, stirred at room temperature for 15 minutes, then transferred the resulting mixture to a 3-(3,5-dichlorophenyl )-5-methylene-2-oxytetrahydro-2H-pyran-3-carboxylic acid methyl ester Ia (63.0mg, 0.2mmol), (E)-6-((E)-3-phenylene Alkenyl)-benzo[d][1,3]dioxa-5-(6H)-one Ⅱa (50.4mg, 0.2mmol) and In a flask of molecular sieves (300mg), the reaction mixture was stirred and reacted at -20°C for 16h under nitrogen protection; the reaction solution was separated and purified by silica gel column chromatography (eluent: EA / PE=0...
Embodiment 2
[0056] (9S,10S)-9-(3,5-Dibromophenyl)-7-methylene-10-((E)-styryl)-7,8,9,10-tetrahydro-6H- Synthesis of [1,3]bisoxazol[4',5':4,5]benzo[1,2-b]oxoctanoic acid-9-carboxylate methyl ester (Ⅲba)
[0057] The reaction scheme is as follows:
[0058]
[0059] The operation steps are as follows:
[0060] Under nitrogen protection, add Pd to a dry 5 mL reaction vial 2 (dba) 3 · CHCl 3 (0.005mmol, 5.2mg), chiral ligand (0.022mmol, 12.7mg) and 2mL ethylbenzene, stirred at room temperature for 15 minutes, then transferred the resulting mixture to a 3-(3,5-dibromophenyl )-5-methylene-2-oxytetrahydro-2H-pyran-3-carboxylic acid methyl ester Ⅰb (80.8mg, 0.2mmol), (E)-6-((E)-3-phenylene Alkenyl)-benzo[d][1,3]dioxa-5-(6H)-one Ⅱa (50.4mg, 0.2mmol) and In a flask of molecular sieves (300mg), the reaction mixture was stirred and reacted at -20°C for 16h under nitrogen protection; the reaction solution was separated and purified by silica gel column chromatography (eluent: EA / PE=0.03-0.1:1,...
Embodiment 3
[0067] (9S,10S)-9-(4-Trifluoromethylphenyl)-7-methylene-10-((E)-styryl)-7,8,9,10-tetrahydro-6H- Synthesis of [1,3]bisoxazol[4',5':4,5]benzo[1,2-b]oxoctanoic acid-9-carboxylic acid methyl ester (Ⅲca)
[0068] The reaction scheme is as follows:
[0069]
[0070] The operation steps are as follows:
[0071] Under nitrogen protection, add Pd to a dry 5 mL reaction vial 2 (dba) 3 · CHCl 3 (0.005mmol, 5.2mg), chiral ligand (0.022mmol, 12.7mg) and 2mL ethylbenzene, stirred at room temperature for 15 minutes, then transferred the resulting mixture to a 3-(4-trifluoromethylphenyl )-5-methylene-2-oxytetrahydro-2H-pyran-3-carboxylic acid methyl ester Ic (62.8mg, 0.2mmol), (E)-6-((E)-3-phenylene Alkenyl)-benzo[d][1,3]dioxa-5-(6H)-one Ⅱa (50.4mg, 0.2mmol) and In a flask of molecular sieves (300mg), the reaction mixture was stirred and reacted at -20°C for 16h under nitrogen protection; the reaction solution was separated and purified by silica gel column chromatography (eluent: EA...
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