摘要:
2,4-Pentadienylzirconium complexes are generated from 2,4- or 2,2'-pentadienyl ethers in turn. These compounds react in situ with aldehydes and ketones in a totally gamma -regioselective manner and with predominant anti stereoselectivity to produce bis(homoallylic) alcohols in good yields. Iodocyclization of one of these alcohols represents regio- and stereocontrolled short entry to functionalized tetrahydrofurans. (C) 2001 Elsevier Science Ltd. All rights reserved.