Benzenesulfonic acid, 4-methyl-, compd. with pyridine (1:1) → Methyl 5-(3-((1R,2R,3R,5R)-5-chloro-2-((3S,7R,E)-3,7-dihydroxyoct-1-enyl)-3-hydroxycyclopentyl)propyl)thiophene-2-carboxylate

Temperature

17 °C

A 20 mL vial equipped with a magnetic stirbar was charged with 210 mg of THP-ether 10 (0.40 mmol) was dissolved in 6 mL of methanol. To this was then added 300 mg of pyridinium p-toluenesulfonate (1.20 mmol) and the mixture was stirred at 17° C. over 17 h. The reaction was sampled by TLC and worked up by concentration in vacuo to remove methanol. The residual products were taken up in ethyl acetate and filtered through a 10 g plug of silica gel, eluting the polar product away from the salts with ethyl acetate (300 mL). Concentration of the filtrate yielded 170 mg of products. Final preparative thin layer chromatographic purification yielded 161 mg (91%) of triol 11 as an oil; 1H NMR (CDCl3): 1.18 (d, J=6.3 Hz, 3H), 1.36-1.62 (m, 8H), 1.77 (m, 3H), 1.94 (m, 2H), 2.10-2.34 (m, 5H), 2.43 (Br s, 1H), 2.83 (m, 2H), 3.50 (br s, 1H), 3.71 (br s, 1H), 3.79 (m, 1H), 3.86 (s, 3H), 3.98 (m, 1H), 4.09 (m, 1H), 5.51 (m, 2H), 6.78 (dd, J=3.9 Hz, 1H), 7.62 (d, J=3.9 Hz, 1H).

1. customA 20 mL vial equipped with a magnetic stirbar
2. aliquotThe reaction was sampled by TLC
3. concentrationworked up by concentration in vacuo
4. customto remove methanol
5. filtrationfiltered through a 10 g plug of silica gel
6. washeluting the polar product away from the salts with ethyl acetate (300 mL)

ORD record

ord-d874b8bba3394ad78624ac72234caa51

Source dataset

uspto-grants-2013_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08546603B2