2-(3-Tert-butyl-5-methoxycarbonyl-benzyl)-2-[3-[(triphenyl-methyl)thio]propyl]malonic acid → 2-(3-Tert-butyl-5-methoxycarbonyl-benzyl)-5-[(triphenylmethyl)thio]-pentanoic acid

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Reaction Steps

A solution of 2-(3-tert-butyl-5-methoxycarbonyl-benzyl)-2-[3-[(triphenylmethyl)thio]propyl]-malonic acid XI (6.71 g, 11 mmol) in DMSO (10 ml) was stirred at 130° C. for 1.5 hours. The solvent was removed under reduced pressure and water was added to the residual oil. The precipitate was filtered off, washed with water, and dried under vacuum to afford 2-(3-tert-butyl-5-methoxycarbonyl-benzyl)-5-[(triphenylmethyl)thio]-pentanoic acid XII (5.86 g, 10.3 mmol, 94%) as a white solid: 1H NMR (CD3OD) δ1.3 (s, 9H), 1.3-1.5 (m, 4H), 2.1 (m, 2H), 2.4 (m, 1H), 2.7 (m, 1H), 2.8 (m, 1H), 7.1-7.4 (m, 16H), 7.7 (s, 1H), 7.9 (s, 1H); 13C NMR (CD3OD) δ27.4, 31.7 (3C), 32.3, 32.7, 35.6, 39.2, 48.4, 67.7, 125.7, 127.7, 128.6, 128.9, 130.8, 131.6, 132.0, 140.8, 146.3, 152.7, 170.3, 178.8.

Provenance & Evidence