Process for the preparation of enantiomerically pure 3-phenyl-3-hydroxypropylamine
申请人:——
公开号:US20040110985A1
公开(公告)日:2004-06-10
The present invention relates to an improved process for the synthesis of enantiomerically pure 3-phenyl-3-hydroxypropylamine of formula I; more particularly the present invention relates to the said process using styrene;
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the synthetic strategy features a Sharpless asymmetric dihydroxylation (SAD) route to the target compound, using styrene, a readily accessible starting material gives the optically pure dihydroxy compound (ee >97%; the selective monotosylation of primary alcohol, nucleophilic displacement by cyano and subsequent reduction to amino group furnishes the desired 3-phenyl-3-hydroxypropylamine in enatiomerically pure form, a key intermediate in the synthesis of variety of oxetine related anti-depressant drugs.
The [2+2]cycloaddition of chlorosulfonylisocyanate to simple vinyl ethers derivedfrom the 2-O-sulfonylated (R) and (S) 1-phenyl-1,2-ethanediol leads to 4-alkoxy-azetidin-2-ones with a moderate stereoselectivity. The cycloaddition to analogous (Z)-propenyl ethers proceeds stereospecifically with the retention of the olefin configuration. The intramolecular alkylation of beta-lactam nitrogen atom furnished
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.
METHOD FOR THE PREPARATION OF OPTICALLY ACTIVE 2-SULFONYLOXY-1-PHENYLETHANOL DERIVATIVES
申请人:Lee Kee-In
公开号:US20100063317A1
公开(公告)日:2010-03-11
Optically active 2-sulfonyloxy-1-phenylethanol derivative of formula (II) can be prepared easily and selectively by the method of the present invention using an asymmetric reduction of an α-sulfonyloxy acetophenone compound with a rhodium catalyst having petamethylcyclopentadienyl group and a hydrogen donor, and the compound of formula (II) obtained in the inventive method exhibits a higher e.e. (enantiomer excess) value than that of the products in the conventional methods.