Prenderol → HCID 59089977, compound

Participants

Reaction Conditions

Reaction Steps

ADC01 (2.9 g, 16.9 mmol) was slowly added to a solution of N-benzyl-3,4-dihydroxypyrrole-2,5-dicarboxylic acid diethyl ester (2.6 g, 7.7 mmol), 2,2-diethyl-1,3-propanediol (1.1 g, 8.5 mmol), and PH02 (4.4 g, 16.9 mmol) in dry tetrahydrofuran (150 ml) at 0° C. The reaction mixture was then allowed to warm to 25° C., stirred for 3 h, and then was refluxed for 21 h. The reaction mixture was then allowed to cool to 25° C. and was concentrated by rotary evaporator to remove the tetrahydrofuran. The residue was then diluted with diethyl ether and allowed to stand overnight to enable the tributylphosphine oxide to precipitate out. The tributylphosphine oxide was then removed by filtration and the remaining product was purified by chromatography on silica gel (eluant: ethyl acetate/hexane=3/1) to give 2-benzyl-6,6-diethyl-6, 7-dihydro-2H,5H-4,8-dioxa-2-aza-azulene-1,3-dicarboxylic acid diethyl ester as a colourless oil in 2.5 g (75%) yield as characterized by 1H NMR, 13C NMR, HRMS, and elemental analysis.

Provenance & Evidence