Chemoselective Additions of Chloromethyllithium Carbenoid to Cyclic Enones: A Direct Access to Chloromethyl Allylic Alcohols
作者:Vittorio Pace、Laura Castoldi、Wolfgang Holzer
DOI:10.1002/adsc.201301042
日期:2014.5.26
Chloromethyllithium carbenoid has been chemoselectively added to cyclicenones (5‐, 6‐ and 7‐membered systems, including two natural products) to provide chloromethyl allylic alcohols. Under the optimized reaction conditions neither concomitant (n+1) homologation nor conjugateaddition or Simmons–Smith‐like cyclopropanation takes place. The presence of LiBr is estimated to play a dual role, namely