1,3-Dithiane → (3-Buten-1-yl)(1,3-dithian-2-yl)diphenylsilane

HRID 962819

Reaction equation

HRID 962819 reaction equation
[S:1]1[CH2:6][CH2:5][CH2:4][S:3][CH2:2]1.C([Li])CCC.[CH2:12]([Si:16]([C:24]1[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=1)([C:18]1[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=1)F)[CH2:13][CH:14]=[CH2:15]>C1COCC1>[CH2:12]([Si:16]([CH:2]1[S:3][CH2:4][CH2:5][CH2:6][S:1]1)([C:24]1[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=1)[C:18]1[CH:19]=[CH:20][CH:21]=[CH:22][CH:23]=1)[CH2:13][CH:14]=[CH2:15]

Participants

5

Reactant 3

HCID 104511,3-DithianeHCID 22015847(3-Buten-1-yl)diphenylfluorosilaneHCID 178418339Butyllithium

Product 1

HCID 15349849(3-Buten-1-yl)(1,3-dithian-2-yl)diphenylsilane

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent2×

Procedure

To a solution of 1,3-dithiane (6.77 g, 56.3 mmol) in THF (120 mL) at -78° C. was added dropwise over 10 min n-butyllithium (1.6M in hexane, 50 mmol), and the solution was stirred for 2 h under argon. A solution of 31 (11.1 g, 43.3 mmol) in THF (100 mL) was added, the mixture was stirred for 3 h at -78° C., and overnight at rt. The reaction mixture was quenched with water (100 mL) and the organic layer isolated. The aqueous layer was extracted with two 100-mL portions of ethyl ether. The combined organic extracts were washed with saturated aqueous NaCI, dried over Na2 SO4, and concentrated. Flash chromatography over silica gel (1/9EtOAc:hexane) gave 32 contaminated with 3-dithiane. The latter was removed by sublimation (54° C., 8.0 mm Hg). Recrystallization from Et2O provided pure 32 as a colorless solid (14.8 g, 96%): R.function. =0.40 (1/49 EtOAc:hexane); mp 47°-49° C.; 1H NMR (300 MHz, CDCl3) δ7.66 (d, J=7.8 Hz, 4H), 7.43 (m, 6H), 5.90 (m, 1H), 5.02 (dd, J=17.1, 1.7 Hz, 1H), 4.91 (dd, J=10.2, 1.7 Hz, 1H), 4.26 (s, IH), 2.92 (t, J=11.8 Hz, 2H), 2.71 (m, 2H), 2.19 (m, 2H), 2.07 (m, 2H), 1.37 (m, 2H); 13C NMR (75 MHz, CDCl3) δ141.1, 135.9, 132.4, 130.2, 128.0, 113.2, 32.3, 31.5, 27.5, 25.8, 10.5; IR (film) 3068 (m), 3047 (m), 2897 (s), 2840 (m), 1961 (w), 1890 (w), 1826 (w), 1639 (m), 1490 (w), 1429 (s), 1275 (m), 1112 (s), 1003 (m), 911 (s), 785 (m), 744(s), 703 (s) cm-1 ; MS (FAB) m/e (rel. intensity) 357 (M+, 11), 356 (11), 355 (25), 301 (18), 279 (13), 237 (36), 227 (11), 225 (18), 221 (14), 215 (14), 213 (18), 212 (12), 211 (100), 209 (9), 207 (15); HRMS (FAB) calcd for C20H23S2 Si: 355.1010 (MH+ -2), found: 355.1020. Anal. Calcd for C20 H24S2Si: C, 67.36; H, 6.78. Found: C, 67.08; H, 6.78.

Workup

  1. stirringthe mixture was stirred for 3 h at -78° C.
  2. customovernight
  3. customat rt
  4. customThe reaction mixture was quenched with water (100 mL)
  5. customthe organic layer isolated
  6. extractionThe aqueous layer was extracted with two 100-mL portions of ethyl ether
  7. washThe combined organic extracts were washed with saturated aqueous NaCI
  8. customdried over Na2 SO4
  9. concentrationconcentrated

Sources & evidence

ORD record
ord-da62a93a9668413a96db0b7645487f15
Source dataset
uspto-grants-1998_06
Patent number
US05760019

Linked notes

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