Generation and electrophilic substitution reactions of 3-lithio-2-methyleneaziridines
摘要:
2-Methyleneaziridinyl anions can be produced by selective deprotonation of the parent aziridine at C-3 using sec-BuLi/TMEDA. Subsequent reaction with a wide variety of electrophiles including MeI, ICH2CH2CH2CH2Cl, PhCH2Br, allyl bromide, Me3SiCl, Bu3SnCl, PhCHO and Ph2CO provides the corresponding C-3 substituted derivatives in moderate to good yields (43-91%). In the case of homochiral methyleneaziridines bearing an (S)-alpha-methylbenzyl group on nitrogen, high levels of diastereocontrol (up to 90%de) can be achieved in this lithiation/alkylation sequence. (c) 2006 Elsevier Ltd. All rights reserved.
A Lewis Acid Catalyzed Intramolecular [4+3] Cycloaddition Route to Polycyclic Systems That Contain a Seven-Membered Ring
作者:Gildas Prié、Natacha Prévost、Heather Twin、Stephanie A. Fernandes、Jerome F. Hayes、Michael Shipman
DOI:10.1002/anie.200461084
日期:2004.12.3
Generation and electrophilic substitution reactions of 3-lithio-2-methyleneaziridines
作者:Cyril Montagne、Natacha Prévost、Jason J. Shiers、Gildas Prié、Sabitur Rahman、Jerome F. Hayes、Michael Shipman
DOI:10.1016/j.tet.2006.06.083
日期:2006.9
2-Methyleneaziridinyl anions can be produced by selective deprotonation of the parent aziridine at C-3 using sec-BuLi/TMEDA. Subsequent reaction with a wide variety of electrophiles including MeI, ICH2CH2CH2CH2Cl, PhCH2Br, allyl bromide, Me3SiCl, Bu3SnCl, PhCHO and Ph2CO provides the corresponding C-3 substituted derivatives in moderate to good yields (43-91%). In the case of homochiral methyleneaziridines bearing an (S)-alpha-methylbenzyl group on nitrogen, high levels of diastereocontrol (up to 90%de) can be achieved in this lithiation/alkylation sequence. (c) 2006 Elsevier Ltd. All rights reserved.