5--5,6-dihydro-4-methoxy-6-methylene-2H-pyran-2-one

Base Information

• Chemical Name: 5--5,6-dihydro-4-methoxy-6-methylene-2H-pyran-2-one
• CAS No.: 109745-99-5
• Molecular Formula: C₁₈H₁₈O₇S
• Molecular Weight: 378.403

Synonyms:5--5,6-dihydro-4-methoxy-6-methylene-2H-pyran-2-one

Chemical Property of 5--5,6-dihydro-4-methoxy-6-methylene-2H-pyran-2-one

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Technology Process of 5--5,6-dihydro-4-methoxy-6-methylene-2H-pyran-2-one

There total 1 articles about 5--5,6-dihydro-4-methoxy-6-methylene-2H-pyran-2-one which guide to synthetic route it. The literature collected by LookChem mainly comes from the sharing of users and the free literature resources found by Internet computing technology. We keep the original model of the professional version of literature to make it easier and faster for users to retrieve and use. At the same time, we analyze and calculate the most feasible synthesis route with the highest yield for your reference as below:

synthetic route:

Reference yield: 53.0%

dimethyl diazomalonate (6773-29-1) + 4-methoxy-6-(phenylthiomethyl)-2H-pyran-2-one (93338-99-9) → 5--5,6-dihydro-4-methoxy-6-methylene-2H-pyran-2-one (109745-99-5) + dimethyl (3SR,8RS)-8--7-methoxy-5-oxo-4-oxaspiro<2,5>oct-6-ene-1,1-dicarboxylate (107468-01-9,109746-05-6)

Guidance literature:

With dirhodium tetraacetate; In toluene; at 90 ℃;

DOI:10.1016/S0040-4039(00)84878-9

Reference yield: 76.0%

5--5,6-dihydro-4-methoxy-6-methylene-2H-pyran-2-one (109745-99-5) → 5--4-methoxy-6-methyl-2H-pyran-2-one (107468-02-0)

Guidance literature:

With silica gel; ethyl acetate; In ethanol; at 25 ℃;

DOI:10.1016/S0040-4039(00)84878-9

Reference yield:

dimethyl diazomalonate (6773-29-1) + 5--5,6-dihydro-4-methoxy-6-methylene-2H-pyran-2-one (109745-99-5) → dimethyl (3SR,8RS)-8--7-methoxy-5-oxo-4-oxaspiro<2,5>oct-6-ene-1,1-dicarboxylate (107468-01-9,109746-05-6)

Guidance literature:

With dirhodium tetraacetate; In toluene; at 90 ℃; Yield given;

DOI:10.1016/S0040-4039(00)84878-9

upstream raw materials:

dimethyl diazomalonate

4-methoxy-6-(phenylthiomethyl)-2H-pyran-2-one

Downstream raw materials:

dimethyl (3SR,8RS)-8--7-methoxy-5-oxo-4-oxaspiro<2,5>oct-6-ene-1,1-dicarboxylate

5--4-methoxy-6-methyl-2H-pyran-2-one

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