Abstract
Functionalized 3-hydroxymaleic anhydrides were prepared by cyclization of 1,1-bis(trimethylsilyloxy)ketene
acetals with oxalyl chloride.
Key words
anhydrides - cyclizations - ketene acetals - oxalyl chloride - silyl enol ethers
References
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To a CH2Cl2 solution (17.8 mL) of oxalyl chloride (0.20 mL, 2.3 mmol) and 1a (0.50 g, 1.8 mmol) was added a CH2Cl2 solution (5 mL) of TMSOTf (0.16 mL, 0.9 mmol) at 78 °C. The temperature of the solution
was allowed to rise to 20 °C during 12 h. After stirring for 3 h at 20 °C, an aq solution
of HCl (10%) was added. The organic and the aqueous layer were separated and the latter
was extracted three times with CH2Cl2. The combined organic layers were dried (Na2SO4), filtered and the solvent of the filtrate was removed in vacuo. The residue was
purified by chromatography (silica gel, hexane-EtOAc) to give 3a as a yellow solid (240 mg, 70%), mp 164 °C. 1H NMR (300 MHz, CDCl3): δ = 7.42-7.50 (m, 3 H, Ar), 8.05-8.08 (m, 2 H, Ar). 13C NMR (75 MHz, CDCl3): δ = 112.0 (C), 126.9 (C), 128.8 (CH), 129.1 (CH), 130.3 (CH), 149.4 (C), 163.4
(C), 163.5 (C). IR (neat): 3244 (s), 3123 (w), 1840 (s), 1760 (s), 1673 (s), 1393
(s), 1262 (s), 939 (s), 762 (s) cm-1. MS (EI, 70 eV): m/z (%) = 190 (43) [M+], 162 (100), 145 (22), 118 (27), 105 (15), 89 (81), 77 (8). Anal. Calcd for C10H6O4: C, 63.16; H, 3.18. Found: C, 62.87; H, 3.63.
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