Cyclopentannulation of enones with organocuprate reagents containing an acetal or an orthoester function
摘要:
1,1-Dimethyl-3-(phenyldio)-propane 4 was deprotonated with t-BuLi, then converted to the corresponding organocuprate reagent which, in the presence of HMPA and TMSCl was added to a variety of enones to give the corresponding silylenol ethers 7. These were cyclised without purification upon acidic conditions to give the cyclopentannulation products 9. A similar result was obtained with the corresponding orthoester reagent 6. This cyclopentannulation sequence is applicable to a wide variety of enones except for those bearing substituents near the reacting centre. (C) 2002 Published by Elsevier Science Ltd.
Cyclopentannulation of enones with organocuprate reagents containing an acetal or an orthoester function
摘要:
1,1-Dimethyl-3-(phenyldio)-propane 4 was deprotonated with t-BuLi, then converted to the corresponding organocuprate reagent which, in the presence of HMPA and TMSCl was added to a variety of enones to give the corresponding silylenol ethers 7. These were cyclised without purification upon acidic conditions to give the cyclopentannulation products 9. A similar result was obtained with the corresponding orthoester reagent 6. This cyclopentannulation sequence is applicable to a wide variety of enones except for those bearing substituents near the reacting centre. (C) 2002 Published by Elsevier Science Ltd.
Cyclopentannulation of enones with organocuprate reagents containing an acetal or an orthoester function
作者:Pingyu Ding、Léon Ghosez
DOI:10.1016/s0040-4020(01)01248-0
日期:2002.2
1,1-Dimethyl-3-(phenyldio)-propane 4 was deprotonated with t-BuLi, then converted to the corresponding organocuprate reagent which, in the presence of HMPA and TMSCl was added to a variety of enones to give the corresponding silylenol ethers 7. These were cyclised without purification upon acidic conditions to give the cyclopentannulation products 9. A similar result was obtained with the corresponding orthoester reagent 6. This cyclopentannulation sequence is applicable to a wide variety of enones except for those bearing substituents near the reacting centre. (C) 2002 Published by Elsevier Science Ltd.