Intramolecular acryloxypalladation. Stereospecific synthesis of ring fused unsaturated α-methylene γ-butyrolactones
摘要:
The intramolecular carboxypalladation reaction [Pd(OAc)(2) 5 mol% NaOAc 2 eq, O-2, THF, rt] of 2-(2-Cycloalken-1-yle) propenoic acids yields ring fused alpha-methylene gamma-butyrolactones with good yields (75-80%). (C) 1997, Published by Elsevier Science Ltd.
this article is a palladium(II)/copper(II)‐ or palladium(II)‐catalyzed intermolecular cyclization of acrylic acid with alkenes to produce α‐methylene‐γ‐butyrolactone derivatives using molecular oxygen as an environmentally benign oxidant. In this system, the carboxylato, especially trifluoroacetato, or trimethylacetato ligand, plays a quite important role to afford a high catalytic activity by suppressing