tert-Butyldimethylsilyl chloride → 3-((tert-Butyldimethylsilanyl)oxy)azetidine

A solution of tert-butylchlorodimethylsilane (12.01 g, 79.69 mmol) in DCM (20 mL) was added dropwise to a stiffed solution of azetidin-3-ol hydrochloride (CAS no. 18621-18-6) (8.73 g, 79.69 mmol) and anhydrous N-ethyl-N-isopropylpropan-2-amine (34.1 mL, 199.22 mmol) in DCM (20 mL) cooled to 10° C., over a period of 2 minutes under nitrogen. The resulting solution was stirred at ambient temperature for 20 hours. The reaction mixture was concentrated, diluted with EtOAc (75 mL), and washed sequentially with saturated NaHCO3 (25 mL), water (20 mL), and saturated brine (20 mL). The organic layer was dried (MgSO4), filtered and evaporated to afford the product (11.1 g, 74%). 1H NMR (400 MHz, CDCl3) δ 0.04 (6H, s), 0.87 (9H, m), 2.80 (1H, s), 3.57-3.61 (2H, m), 3.67-3.71 (2H, m), 4.57-4.64 (1H, m).

1. concentrationThe reaction mixture was concentrated
2. additiondiluted with EtOAc (75 mL)
3. washwashed sequentially with saturated NaHCO3 (25 mL), water (20 mL), and saturated brine (20 mL)
4. dry with materialThe organic layer was dried (MgSO4)
5. filtrationfiltered
6. customevaporated

ORD-Eintrag

ord-60a0f31b4a2f49388c0670a361b4eb0d

Quelldatensatz

uspto-grants-2011_12

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08071585B2