Short asymmetric syntheses of homoallylic, homopropargylic and allenic silylated primary amines
摘要:
Amino alcohols derived from phenylglycinol and having vinyl-, alkynyl- or allenylsilane moieties were transformed in the corresponding primary amines in two steps: oxidative cleavage of phenylglycinol and transimination with phenylhydrazine. This methodology gave general access to enantiomerically enriched amines without loss of enantioselectivity. (C) 2004 Elsevier Ltd. All rights reserved.
Diastereoselective reactions between oxazolidines and organolithiumreagents afford β-amino alcohols having chiral vinyl and alkynylsilane moieties. A meaningful change of regioselectivity, from the α- to the γ-position, occurred when these reactions were performed in the presence of titanium isopropoxide, since allyl and allenylsilane derivatives were thus produced.