1,1,3,3-Tetramethylguanidine → HCID 59038467, compound

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Reaction Steps

1,1,3,3-Tetramethylguanidine (60 μL, 0.48 mmol) was added to a solution of rac.-(E)-N-[2-chloro-4-[1-hydroxy-3-(3-hydroxyphenyl)prop-2-en-1-yl]benzoyl]-2-(dimethoxyphosphinyl)glycine methyl ester (Example 135; 116 mg, 0.24 mmol) in tetrahydrofuran (5 mL) at −20° C. After 10 min, 2,4-dimethylthiazole-5-carboxaldehyde (Example 43; 36 mg, 0.255 mmol) was added and the solution was stirred at room temperature for 16 h. The solvent was evaporated and ethyl acetate (10 mL) was added. The solution was washed with saturated sodium bicarbonate solution (10 mL) and brine (10 mL). Each aqueous layer was extracted with ethyl acetate (10 mL). The combined organic layers were dried, filtered, evaporated and chromatographed (60% ethyl acetate/hexanes) to give rac.-(Z)-2-[[2-chloro-4-[(E)-1-hydroxy-3-(3-hydroxyphenyl)prop-2-en-1-yl]benzoyl]amino]-3-(2,4-dimethylthiazol-5-yl)propenoic acid methyl ester (101 mg, 84% yield) as a colorless oil.

Provenance & Evidence