An efficient stereoselective preparation of cis-perfluoroalkenylzinc reagents [(E)-RFCFCFZnCl] by the metallation of 1H,1H-perfluoroalkanes and their derivatization to cis-1-arylperfluoroalkenes [(Z)-RFCFCFAr]
摘要:
Various 1H1H-perfluoroalkanes (RFCF2CH2F, R-F = CF3, C2F5, C4F9, C5F11, C6F13, C10F21) were metallated using LDA in a THF solution of ZnCl2 at RT or -78 degrees C to produce the corresponding perfluoroalkenylzinc reagents (RFCF=CFZnCl) in a cis-selective fashion. An increased yield (75-83%) and cis-selectivity (>89%) of the perfluoroalkenylzinc reagents were observed for metallation reactions performed at -78 degrees C. The cis selectivity was excellent for 1H,1H-perfluoroalkanes with larger RF groups (C4F9, C5F11, C6F13, >96%). The cis-perfluoroalkenylzinc [(E)-RFCF=CFZnCl] reagents were coupled with aryl iodides to obtain cis-1-arylperfluoroalkenes [(Z)-RFCF=CFAr] in 71-95% isolated yields. The cis-perfluoroalkenylzinc reagents upon iodinolysis produced cis-1-iodoperfluoroalkenes [(E)-RFCF=CFI] in 68-70% isolated yield. (C) 2006 Elsevier B.V. All rights reserved.
An efficient stereoselective preparation of cis-perfluoroalkenylzinc reagents [(E)-RFCFCFZnCl] by the metallation of 1H,1H-perfluoroalkanes and their derivatization to cis-1-arylperfluoroalkenes [(Z)-RFCFCFAr]
摘要:
Various 1H1H-perfluoroalkanes (RFCF2CH2F, R-F = CF3, C2F5, C4F9, C5F11, C6F13, C10F21) were metallated using LDA in a THF solution of ZnCl2 at RT or -78 degrees C to produce the corresponding perfluoroalkenylzinc reagents (RFCF=CFZnCl) in a cis-selective fashion. An increased yield (75-83%) and cis-selectivity (>89%) of the perfluoroalkenylzinc reagents were observed for metallation reactions performed at -78 degrees C. The cis selectivity was excellent for 1H,1H-perfluoroalkanes with larger RF groups (C4F9, C5F11, C6F13, >96%). The cis-perfluoroalkenylzinc [(E)-RFCF=CFZnCl] reagents were coupled with aryl iodides to obtain cis-1-arylperfluoroalkenes [(Z)-RFCF=CFAr] in 71-95% isolated yields. The cis-perfluoroalkenylzinc reagents upon iodinolysis produced cis-1-iodoperfluoroalkenes [(E)-RFCF=CFI] in 68-70% isolated yield. (C) 2006 Elsevier B.V. All rights reserved.
An efficient stereoselective preparation of cis-perfluoroalkenylzinc reagents [(E)-RFCFCFZnCl] by the metallation of 1H,1H-perfluoroalkanes and their derivatization to cis-1-arylperfluoroalkenes [(Z)-RFCFCFAr]
作者:Anilkumar Raghavanpillai、Donald J. Burton
DOI:10.1016/j.jfluchem.2005.12.022
日期:2006.5
Various 1H1H-perfluoroalkanes (RFCF2CH2F, R-F = CF3, C2F5, C4F9, C5F11, C6F13, C10F21) were metallated using LDA in a THF solution of ZnCl2 at RT or -78 degrees C to produce the corresponding perfluoroalkenylzinc reagents (RFCF=CFZnCl) in a cis-selective fashion. An increased yield (75-83%) and cis-selectivity (>89%) of the perfluoroalkenylzinc reagents were observed for metallation reactions performed at -78 degrees C. The cis selectivity was excellent for 1H,1H-perfluoroalkanes with larger RF groups (C4F9, C5F11, C6F13, >96%). The cis-perfluoroalkenylzinc [(E)-RFCF=CFZnCl] reagents were coupled with aryl iodides to obtain cis-1-arylperfluoroalkenes [(Z)-RFCF=CFAr] in 71-95% isolated yields. The cis-perfluoroalkenylzinc reagents upon iodinolysis produced cis-1-iodoperfluoroalkenes [(E)-RFCF=CFI] in 68-70% isolated yield. (C) 2006 Elsevier B.V. All rights reserved.