Gold Catalysis: Efficient 1,3-Induction with Diastereotopic Homopropargyl Alcohols in the Phenol Synthesis
作者:A. Stephen K. Hashmi、Melissa Hamzić、Matthias Rudolph、Martin Ackermann、Frank Rominger
DOI:10.1002/adsc.200900402
日期:2009.10
Furans with diastereotopic alkynyl groups were prepared and then converted to anellated phenols in gold-catalyzed reactions. In all cases a highly diastereoselective reaction was observed. The stereochemical outcome of the 1,3-induction could be assigned by two independent crystal structure analyses, showing a cis-arrangement of the two alkyl substituents on the benzoanellated cyclohexene ring.
作者:A. Stephen K. Hashmi、Melissa Hamzić、Frank Rominger、Jan W. Bats
DOI:10.1002/chem.200901695
日期:2009.12.14
Selecting one out of two enantiotopic alkynes: A furan–diyne substrate with enantiotopic alkynyl groups was prepared and the gold‐catalyzed cycloisomerization by a series of different chiral cationic gold(I) complexes was investigated (see scheme).