You can introduce a chiral auxiliary to a starting material, which temporarily imparts chirality to the molecule. The reaction to create the quaternary carbon is then carried out with high stereoselectivity under the influence of the chiral auxiliary. After the reaction is complete, the chiral auxiliary is often removed, yielding the desired product.
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(3R,5S)-3-methyl-5-((trityloxy)methyl)dihydrofuran-2(3H)-one
dysidazirine
(S)-2-N,N-dibenzylamino-3-cyanopropanoic acid benzyl ester
