The crude earthworm extract catalysed direct
asymmetric Mannich reactions
The asymmetric Mannich reaction is a powerful synthetic
strategy to prepare chiral b-amino ketones and aldehydes with
perfect atom economy through the loss of a molecule of water, and
the reaction products are versatile intermediates in the synthesis of
chiral amines [18]. The crude earthworm extract could catalyse
the direct asymmetric Mannich reactions in isopropanol/buffer
(Fig. 3). Various substituted aromatic aldehydes, arylamines and
cyclic or heterocyclic ketones participated in the reaction