Piperidine-Mediated [3 + 3] Cyclization of 2-Amino-4H-chromen-4-ones and 2-Benzylidenemalononitriles: To Access 2-Aminochromeno[2,3-b]pyridine Derivatives

Piperidine-mediated [3 + 3] cyclization of 2-amino-4H-chromen-4-ones and substituted 2-benzylidenemalononitriles was developed for the synthesis of 2-amino-4-aryl-5H-chromeno[2,3-b]pyridin-5-one derivatives. This novel transformation provides a highly efficient and facile route to functionalized 5H-chromeno[2,3-b]pyridines from readily available substrates under mild reaction conditions.

An efficient catalyst-free one-pot synthesis of primary amides from the aldehydes of the Baylis–Hillman reaction

Herein, a facile and efficient method for the preparation of allyl amides from the aldehydes of Baylis–Hillman adducts has been developed using a hydroxylamine/methanol system under a catalyst-free condition.