Studies towards the diastereoselective spiroannulation of phenolic derivatives
摘要:
The oxidative spiroannulation of simple phenols bearing a chiral center was carried out. Good yields (61-83%) of spirocompounds were obtained. An increase in diastereomeric ratios front 55/45 to 81/19 was observed as the steric factor Surrounding the chiral carbon increased. (C) 2002 Elsevier Science Ltd. All rights reserved.
Selective hydrogenation of conjugated unsaturated ketones containing a hydroxyaryl substituent in the β-position
摘要:
A high selectivity was achieved in the Ni2B-catalyzed hydrogenation of alpha,beta-unsaturated ketones containing a hydroxyaryl (phenolic) substituent in the beta-position. The developed hydrogenation procedure was used to synthesize natural compounds of the phenylpropane series and their structural analogs.