In a diastereoselective way.

(chemistry) selective control of the formation of diastereoisomers in a reaction

(chemistry) selection of the required diastereoisomer in a reaction, especially by using diastereocontrol

(chemistry) Describing any reaction that preferentially involves one side (face) of an approximately planar diastereoisomer

plural of diasterane

(organic chemistry) Any of a group of isomers of steranes formed during diagenesis

(organic chemistry) The simplest possible asterane tricyclo[3.1.1.12,4]octane, or [2]asterane

plural of diastereoselection

(chemistry) The chemistry of diastereomers

(organic chemistry) The formation of one diastereoisomer rather than another