Methanesulfonyl chloride → 1,4-Dioxaspiro(4.5)decan-8-yl methanesulfonate

HRID 1735279Notes

Reaction equation

HRID 1735279 reaction equation
[O:1]1[C:5]2([CH2:10][CH2:9][CH:8]([OH:11])[CH2:7][CH2:6]2)[O:4][CH2:3][CH2:2]1.[CH3:12][S:13](Cl)(=[O:15])=[O:14]>C(Cl)Cl>[CH3:12][S:13]([O:11][CH:8]1[CH2:9][CH2:10][C:5]2([O:4][CH2:3][CH2:2][O:1]2)[CH2:6][CH2:7]1)(=[O:15])=[O:14]

Participants

4

Reactant 2

HCID 31297Methanesulfonyl chlorideHCID 5673521,4-Dioxaspiro(4.5)decan-8-ol

Product 1

HCID 149667411,4-Dioxaspiro(4.5)decan-8-yl methanesulfonate

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

When n is the bridging group --C(Cl)=CH--, 1,4-cyclohexanedione mono-ethylene ketal is reduced with sodium borohydride in ethanol, yielding the corresponding 1,4-dioxaspiro[4.5]decan-8-ol. The so-prepared alcohol is then treated with methanesulfonyl chloride under basic conditions in methylene chloride, affording 8-methylsulfonyloxy-1,4-dioxaspiro[4.5]decane, which is in turn treated with sodium hydride in tetrahydrofuran, and then is reacted with trimethylsilylacetylene, yielding 8-(trimethylsilylethynyl)-1,4-dioxaspiro[4.5]decane. This compound is then treated with sodium carbonate in methanol to unprotect the ethynyl moiety, affording 8-ethynyl-1,4-dioxaspiro[4.5]decane. The so-prepared ethynyl compound is reacted with an appropriately substituted or unsubstituted phenyl iodide, for example, 3,5-di(trifluoromethyl)phenyl iodide, under basic conditions in the presence of bis(triphenylphosphine)palladium(II) chloride and copper(I) iodide in acetonitrile, and then is treated with 1N hydrochloric acid, yielding the corresponding 4-(phenylethynyl)cyclohexanone. The cyclohexanone is then reacted with cyanoguanidine, as previously described, affording the 2,4-diamino-6-phenylethynyl-5,6,7,8-tetrahydroquinazoline. Chlorination of the 6-phenylethynyl-5,6,7,8-tetrahydroquinazoline, using the methods of J. Cousseau (JCS Faraday II, 1973, 1821, and JCS Perkin I, 1977, 1797), affords the targeted 2,4-diamino-6-[1-chloro-2-phenylethenyl]-5,6,7,8-tetrahydroquinazoline. Example 8 provides a detailed description of how this reaction is conducted.

Sources & evidence

ORD record
ord-b1f25fa0f30e4e9799cb43a8daa69ab2
Source dataset
uspto-grants-1996_07
Patent number
US05536725

Reaction notes

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