Water → HCID 69747005, compound

Participants

Reaction Steps

In a dry flask (3S,4R)-4-aminopiperidine-1,3-dicarboxylic acid 1-tert-butyl ester (1.32 g, 5.40 mmol) was dissolved in dichloromethane (30 mL) and triethylamine (1.0 mL, 7.2 mmol) and benzyl chloroformate (0.94 mL, 5.9 mmol) were added. The mixture was stirred for 18 hours. Water (30 mL) was added and the layers separated. The aqueous layer was extracted with dichloromethane (30 mL). The combined organic layers were washed with brine, dried with magnesium sulfate, filtered, and concentrated in vacuo to give a crude oil (2.13 g). Purification by flash column chromatography (5-20% methanol/chloroform) provided a colorless oil (1.29 g, 63%). 1H NMR (400 MHz, DMSO-d6, 120° C.), δ: 7.34 (m, 5H), 6.76 (bs, 1H), 5.04 (s, 2H), 4.01, (bs, 1H), 3.78 (dd, J=14, J′=7, 1H), 3.47 (m, 2H), 3.26 (m, 1H), 2.67 (dt, J=7, J′=4, 1H), 2.49 (m, 1H), 1.79 (m, 1H), 1.59 (m, 1H), 1.40 (s, 9H). MS (ESI), m+/z: (M+Na)+=401.

Provenance & Evidence