A process for preparing a 1,2-ethanediol derivative in a high yield by reducing an α-hydroxy carboxylic acid ester derivative in a protic solvent or a hydrous aprotic polar solvent in the presence of a sodium boron hydride compound. A process for preparing a 1,2-ethanediol derivative in a high yield by esterifying an α-hydroxy carboxylic acid derivative to synthesize an α-hydroxy carboxylic acid ester derivative, and reducing this ester derivative in a protic solvent or a hydrous aprotic polar solvent in the presence of a sodium borohydride compound in the same reaction vessel.
ACETALSULFONATE DERIVATIVE, PROCESS FOR PRODUCING THE SAME, AND PROCESS FOR PRODUCING STYRENE OXIDE DERIVATIVE
申请人:Mitsubishi Rayon Co., Ltd.
公开号:EP1236714A1
公开(公告)日:2002-09-04
There are provided an acetalsulfonate derivative useful as an intermediate for medicines and agricultural chemicals, a process for industrially producing the derivative, and a process for industrially producing a styrene oxide derivative from the acetalsulfonate derivative or from a mandelic acid derivative.
A process for producing an acetalsulfonate derivative which comprises a first step of esterifying a mandelic acid derivative to form a mandelic ester derivative, a second step of protecting the mandelic ester derivative by an acetal to form an acetal derivative, a third step of reducing the acetal derivative to form an ethanediol derivative and a fourth step of reacting the ethanediol derivative with a sulfonyl chloride derivative. A process for producing a styrene oxide derivative which comprises a deprotecting step of deacetalizing the acetalsulfonate derivative and a step of epoxidizing the sulfonate derivative obtained in the deprotecting step with the aid of a base catalyst.