Abstract: Disclosed a process for preparing substantially enantiomerically pure 3-amino-3-cyclopropylpropanoate esters, i.e., esters of 3-amino-3-cyclopropylpropanoic acid (3-cyclopropylalanine esters or 3-CPA esters) by a 5-step process wherein cyclopropanecarboxaldehyde (CPCA) is reacted with malonic acid and a source of ammonia to obtain 3-cyclopropylalanine (3-CPA); esterifying the 3-CPA; contacting the 3-CPA ester with a substantially enantiomerically pure acid selected from tartaric acid, dibenzoyltartaric acid and mandelic acid to obtain a diastereomeric salt of the 3-CPA ester and the acid; recrystallization of the salt to substantial diastereomeric purity; and neutralizing the salt to afford the substantially enantiomerically pure 3-CPA ester.

Abstract: Disclosed is a process for the preparation of cyclopropylglycine by a 5-step process wherein cyclopropanecarboxaldehyde is reacted with an &agr;-aminoalkylaromatic compound to obtain an imine which is reacted with a cyanide to produce an aminonitrile compound; the aminonitrile compound is hydrolyzed to the corresponding aminocarboxylic acid and finally the arylalkyl residue is removed from the amino group by hydrogenolysis.

Abstract: Disclosed is a process for preparing novel trans-3-alkyloxy-4-hydroxytetrahydrofurans including racemic and substantially enantiomerically pure (3S,4S)-trans-3-alk(en)yloxy-4-hydroxytetrahydrofurans and (3R,4R)-trans-3-alk(en)yloxy-4-acyloxytetrahydrofurans. The disclosed process comprises the steps of reacting 3,4-epoxytetrahydrofuran with an alcohol under Lewis acid catalysis to obtain a racemic trans-3-alk(en)yloxy-4-hydroxytetrahydrofuran; contacting the trans-3-alk(en)yloxy-4-hydroxytetrahydrofuran with an acyl donor in the presence of a hydrolase enzyme to produce a mixture of a substantially enantiomerically pure (3S,4S)-trans-3-alk(en)yloxy-4-hydroxytetrahydrofuran and a substantially enantiomerically pure (3R,4R)-trans-3-alk(en)yloxy-4-acyloxytetrahydrofuran; and separating the components of the mixture by partitioning between water and a solvent immiscible with water.

Abstract: Disclosed is a process for the production of cyclopropylmethyl halides (CPMX) such as cyclopropylmethyl chloride (CPMCI) and cyclopropylmethyl bromide (CPMBr) wherein cyclopropanemethanol (CPMO) is contacted with a complex comprising a dialkyl sulfide and an N-halosuccinimide in the presence of an organic solvent.

Abstract: Disclosed is a process for the preparation of cyclopropylglycine by a 5-step process wherein cyclopropanecarboxaldehyde is reacted with an .alpha.-aminoalkylaromatic compound to obtain an imine which is reacted with a cyanide to produce an aminonitrile compound; the aminonitrile compound is hydrolyzed to the corresponding aminocarboxylic acid and finally the arylalkyl residue is removed from the amino group by hydrogenolysis.

Abstract: Disclosed is a process for the preparation of cyclopropylglycine by a 5-step process wherein cyclopropanecarboxaldehyde is reacted with an .alpha.-aminoalkylaromatic compound to obtain an imine which is reacted with a cyanide to produce an aminonitrile compound; the aminonitrile compound is hydrolyzed to the corresponding aminocarboxylic acid and finally the arylalkyl residue is removed from the amino group by hydrogenolysis.