Generation of quaternary centers by reductive cross-coupling: shifting of regioselectivity in a subset of allylic alcohol-based coupling reactions
摘要:
Regioselective titanium alkoxide-mediated reductive cross-coupling reactions of allylic alcohols with vinylsilanes and imines have previously been demonstrated to proceed with allylic transposition by formal metallo-[3,3]-rearrangement [thought to proceed by a sequence of: (1) directed carbometalation, and (2) syn-elimination]. While many examples have been described that support this reaction path, a collection of substrates have recently been identified that react by way of an alternative pathway, delivering a concise convergent route to coupled products bearing a quaternary center. (C) 2010 Elsevier Ltd. All rights reserved.
Regioselective synthesis of azetidines or pyrrolidines by selenium-induced cyclization of secondary homoallylic amines
作者:Xavier Franck、Stéphane Leleu、Francis Outurquin
DOI:10.1016/j.tetlet.2010.06.087
日期:2010.8
Azetidines or pyrrolidines can be regioselectively obtained by selenocyclization of homoallylic amines, according to the double bond substitution (C) 2010 Elsevier Ltd All rights reserved