Method for producing cyclic sulfonic acid ester and intermediate thereof
View Patent ↗The present invention is directed to provide an efficient production method which is capable of not only obtaining a cyclic sulfonic acid ester (sultone) at low cost and in high yield, but also the sulfonic acid ester (sultone) stably even in a commercial scale. The present invention relates to a method for producing hydroxysultone comprising a first step where a diol having a specified structure and a thionyl halide are reacted to obtain a cyclic sulfite having a specified structure, and a second step where the cyclic sulfite is reacted with water or/and alcohol; a method for producing an unsaturated sultone having a specified structure comprising a third step where a hydroxylsultone having a specified structure is reacted with an acid halide or an acid anhydride to obtain an intermediate, subsequently the intermediate is treated with a base; as well as a cyclic sulfite having a specified structure.
1. A compound represented by the formula [5]:
wherein R2, R3, R4 and R5 represent each independently a hydrogen atom or a C1-3 alkyl group, and L represents a C1-6 alkylsulfonyl group which is optionally substituted by a halogen atom, a C6-10 arylsulfonyl group which is optionally substituted by a halogen atom, a C6-10 arylsulfonyl group, a C2-7 alkylcarbonyl group which is optionally substituted by a halogen atom, or a C7-11 arylcarbonyl group.
2. The compound according to claim 1 , wherein L is a C2-7 alkylcarbonyl group which is optionally substituted by a halogen atom, or a C7-11 arylcarbonyl group.
3. The compound according to claim 1 , wherein L is a C2-7 alkylcarbonyl group which is optionally substituted by a halogen atom.
4. The compound according to claim 1 , wherein L is a C2-7 alkylcarbonyl group.
5. The compound according to claim 1 , wherein L is an acetyl group.
6. The compound according to claim 1 , wherein R 2 , R 3 , R 4 and R 5 are a hydrogen atom.
7. The compound according to claim 1 , wherein the compound represented by the formula [5] is 2-acetoxy-1,3-propanesultone.