UNSPECIFIED. (2004) Chiral biarylamido/anisole complexes of yttrium in enantioselective aminoalkene hydaroamination/cyclisation. DALTON TRANSACTIONS (15). pp. 2251-2256. ISSN 1477-9226

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Abstract

A group of chiral, dibasic, biaryl-bridged amido proligands containing peripheral methoxyphenyl (anisole) ligation are developed for the synthesis of new amide complexes of yttrium and lanthanum. A potentially tetradentate bis(amidoanisole) system L-1 gives, on reaction with [Y{N(SiMe2H)(2)}(3)(THF)] a crystallographically-characterised bis complex [YL1(HL1)] presumably as a result of low steric demand, since a more bulky version L-2 gives the target [(LY)-Y-2{N(SiMe2H)(2)}(THF)]. The molecular structure of the latter reveals a similar cis-alpha structure to our recently reported Schiff-base analogue. Variable-temperature NMR studies are consistent with low rigidity in the molecular structure. A potentially tridentate, amidoanisolyl/amido proligand L-3 gives complexes [(LM)-M-3{N(SiMe2H)(2)}(THF)(n)] (M = Y, n = 1; M = La, n = 2). Chiral non-racemic versions of the above complexes were tested in the hydroamination/cyclisation of 2,2'-dimethylaminopentane to the corresponding pyrrolidine. Activities were relatively low compared to recently reported examples, and ee values were in the range 20-40% despite the well-expressed chirality of the catalysts.

Item Type:	Journal Article
Subjects:	Q Science > QD Chemistry
Journal or Publication Title:	DALTON TRANSACTIONS
Publisher:	ROYAL SOC CHEMISTRY
ISSN:	1477-9226
Date:	2004
Number:	15
Number of Pages:	6
Page Range:	pp. 2251-2256
Identification Number:	10.1039/b400799a
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/8181

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