Regio- and Enantioselective Ring-Opening of Epoxides with HMDST: A Straightforward Access to 1,2-Mercaptoalcohols

Abstract

TBAF-catalyzed reaction of a range of substituted ­epoxides with hexamethyldisilathiane smoothly affords a direct and simple access to β-mercaptoalcohols in a highly regio- and stereoselective way.

epoxides - thiosilane - 1,2-mercaptoalcohols - enantio­selectivity - regioselectivity

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17

Typical Procedure: A solution of 2-methyloxirane (1a, 100 mg, 1.72 mmol) and HMDST (470 µL, 2.24 mmol, 398 mg) in THF (0.1 mL) was treated at r.t. with TBAF (1 M in THF; 450 µL, 0.45 mmol) under an inert atmosphere. The mixture became bright green and after 5 min pale yellow. The reaction was carried out for 30 min and the progress of the reaction monitored by TLC. After addition of citric acid (50% aq solution; 0.5 mL) the mixture was stirred for 5 min, then diluted with Et₂O. The organic phase was then washed with citric acid (20% aq solution), extracted with Et₂O, and dried over Na₂SO₄. Evaporation of the solvent afforded 106 mg of 1-mercaptopropan-2-ol (2a; 65%), which was pure enough to be used without further purification. ¹H NMR (200 MHz, CDCl₃): δ = 1.25 (3 H, d, J = 6.0 Hz), 1.43 (1 H, app t, J = 8.7 Hz), 2.32 (1 H, br s), 2.44-2.56 (1 H, m), 2.60-2.71 (1 H, m), 3.71-3.84 (1 H, m). ¹³C NMR (50 MHz, CDCl₃): δ = 21.7, 33.2, 68.4. MS: m/z (%) = 92 (0.08), 91 (0.25), 75 (11), 45 (100).
Following the above procedure, oxirane 1a and HMDST were treated with a solution of TBAF (225 µL, 0.22 mmol)to give cleanly 2-(trimethylsilyloxy)propane-1-thiol (3a; 203 mg, 72% yield). ¹H NMR (200 MHz, CDCl₃): δ = 0.14 (9 H, s), 1.22 (3 H, d, J = 6.0 Hz), 1.46 (1 H, dd, J = 9.0 Hz, J = 8.8 Hz), 2.43-2.59 (2 H, m), 3.84 (1 H, app sextet). ¹³C NMR (50 MHz, CDCl₃): δ = 0.2, 22.5, 33.3, 70.0. MS: m/z (%) = 164 (0.6), 149 (10), 117 (66), 91 (15), 75 (53), 73 (100).

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