Hydrazine hydrate (1:1) → 2-[(3S)-1-(cyclopropylcarbonyl)-3-pyrrolidinyl]acetohydrazide

Temperature

80 °C

In a round bottom flask equipped with reflux condenser, an orange solution of ethyl [(3S)-1-(cyclopropylcarbonyl)-3-pyrrolidinyl]acetate (56.1 g, 249 mmol) in ethanol (356 mL) was treated with hydrazine monohydrate (242 mL, 4.98 mol). The resultant yellow solution was stirred at 80° C. (reflux) for 15 h. The reaction was cooled to room temperature and concentrated in vacuo. Ethanol (100 mL) was added and the reaction was concentrated (2×) to give a pale yellow clear oil. The oil was dissolved in dichloromethane (white solution observed), dried over MgSO4, concentrated in vacuo, and pumped under high vacuum overnight (16 h) to give the title compound as a clear pale yellow oil (249 mmol, quantitative). MS(ES)+ m/e 212.0 [M+H]+, 423.2 [2M+H]+.

1. customIn a round bottom flask equipped
2. temperaturewith reflux condenser
3. temperature(reflux) for 15 h
4. temperatureThe reaction was cooled to room temperature
5. concentrationconcentrated in vacuo
6. additionEthanol (100 mL) was added
7. concentrationthe reaction was concentrated (2×)
8. customto give a pale yellow clear oil
9. dry with materialdried over MgSO4
10. concentrationconcentrated in vacuo
11. custompumped under high vacuum overnight (16 h)

ORD record

ord-411935610315439ba43f376c7f3fe5b8

Source dataset

uspto-grants-2016_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09340529B2