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DOI: 10.1055/s-0031-1289872
Room-Temperature and Metal-Free Synthesis of 1,1-Dithio-1-alkenes from 1,1-Dibromo-1-alkenes and Thiols
Publication History
Publication Date:
11 November 2011 (online)

Abstract
An efficient metal-free synthesis of 1,1-dithio-1-alkenes from 1,1-dibromo-1-alkenes and thiols using a diazabicycloundecene/dimethyl sulfoxide system was developed. The method was found suitable for various 1,1-dibromo-1-alkenes. The synthesis was completed within 5-15 minutes at room temperature with moderate to excellent yields.
Key words
room temperature - metal-free - 1,1-dithio-1-alkenes - 1,1-dibromo-1-alkenes - thiols
- Supporting Information for this article is available online:
- Supporting Information
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References and Notes
General Procedure
for the Synthesis of 3
DMSO (3 mL), 1,1-dibromo-1-alkenes 1 (0.3 mmol), DBU (1.05 mmol), and thiols 2 (0.66 mmol) were placed in a sealed tube.
The mixture was stirred at r.t., and the reaction was monitored
by TLC. After the reaction was completed, the system was extracted
with Et2O (3 × 25 mL). The combined organic
layer was washed with H2O and was dried over MgSO4.
The solvent was evaporated, and the crude product was purified by
silica gel column chromatography to yield 1,1-dithio-1-alkenes 3.
Selected
Data[2-(4-Isopropylphenyl)ethene-1,1-diyl]bis(
p
-tolyl-sulfane)
(3a)
Light yellow solid. ¹H NMR
(400 MHz, CDCl3): δ = 7.53 (d, J = 7.5 Hz,
2 H), 7.39 (d, J = 8.0
Hz, 2 H), 7.23-7.14 (m, 8 H), 6.98 (d, J = 8.0
Hz, 2 H), 2.34 (s, 3 H), 2.22 (s, 3 H).