ChemicalBook CAS DataBase List (ACETYLMETHYLENE)TRIPHENYLPHOSPHORANE

(ACETYLMETHYLENE)TRIPHENYLPHOSPHORANE synthesis

8synthesis methods

Product Name:(ACETYLMETHYLENE)TRIPHENYLPHOSPHORANE
CAS Number:1439-36-7
Molecular formula:C21H19OP
Molecular Weight:318.35

The preparative method of (Acetylmethylene)triphenylphosphorane: treatment of Triphenylphosphine with chloro- or Bromoacetone provides the phosphonium salt (eq 1). Deprotonation with a weak base such as bicarbonate in cold water provides the crude ylide which may by isolated by filtration.

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603-35-0 Synthesis

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1439-36-7
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$8.00/5g

Yield:1439-36-7 23.3%

Reaction Conditions:

in chloroform at 70; for 12 h;Inert atmosphere;

Steps:

1 [00162] Step 1: l-(triphenylphosphoranylidene)propan-2-one
[00162] Step 1: l-(triphenylphosphoranylidene)propan-2-one: A solution of 1- chloropropan-2-one (50 g, 540.4 mmol) in chloroform (150 mL) was added drop wise to a solution of triphenylphosphine (141.72 g, 540.4 mmol) in chloroform (150 mL) under nitrogen. The mixture was stirred at 70 °C for 12 h, and the resulting phosphonium salt was filtered. The precipitate was washed with ethyl acetate and dried under vacuum. The dried phosphonium salt was suspended in a mixture of water (250 mL) and methanol (250 mL), and the mixture was stirred for 1 h. Aqueous sodium hydroxide (2.00 M) was added to the mixture until a pH between 7 and 8 was reached. The mixture was then stirred vigorously for 1 h. The phosphorane precipitate was filtered and washed with water. After drying in vacuum, the phosphorane was recrystallized from ethyl acetate and dried under vacuum to afford l-(triphenylphosphoranylidene)propan-2-one (40.00 g, 23.3%) as a white solid.

References:

CONSTELLATION PHARMACEUTICALS, INC.;ALBRECHT, Brian, K.;AUDIA, James, Edmund;DAKIN, Les, A.;DUPLESSIS, Martin;GEHLING, Victor, S.;HARMANGE, Jean-Christophe;NASVESCHUK, Christopher, G.;VASWANI, Rishi, G. WO2015/23915, 2015, A1 Location in patent:Paragraph 00161; 00162

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