The synthesis of enantiomerically pure pyrano[4 5-c]pyrroles has been accomplished by the intramolecular hetero Diels-Alder reaction of enantiomerically pure N-allyltetheredalkenyl aldehydes with various 1 3-diones The reaction led to the formation of cis-fused enantiomerically pure pyrano[4 5-c]pyrroles in excellent yield under mild conditions and the products were characterized by spectroscopic data (C) 2010 Elsevier Ltd All rights reserved