(2S,2'S)-2-hydroxymethyl-1-lt;(1-methylpyrrolidine-2-yl)methylgt;pyrrolidine investigation of the asymmetric addition of lithium trimethylsilylacetylides in presence (2S,2'S)-2-hydroxymethyl-1-<(1-methylpyrrolidine-2-yl)methyl>pyrrolidine; Product distributionMechanism;