ISSN:
0009-2940
Keywords:
[2-(Amino)ethenyl]carbene complexes
;
3-Amino-1,2-propadienylidene complexes
;
(2,3,4,6-Tetra-O-pivaloyl-β-D-galactopyranosylamine, carbene complexes of
;
Ketene imines
;
Isocyanides
;
Pyrroles
;
Alkynylcarbene complexes of chromium and tungsten
;
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Organic Syntheses via Transition Metal Complexes, 70[1]. - [2-(Galactopyranosylamino)ethenyl]carbene and 3-(Galactopyranosylamino)-1,2-propadienylidene Complexes on 3-Addition of 2,3,4,6-Tetra-O-pivaloyl-β-D-galactopyranosylamine to Alkynylcarbene Complexes (M = Cr, W). - Atropisomeric Galactopyranosyl Pyrroles by Reaction of [2-(Galactopyranosyl-amino)ethenyl]carbene Complexes with IsocyanidesEnantiomeric pure (2-aminoethenyl)carbene complexes LnM=C(OEt)—CH=C(Ph)NHR* (Z)-3 and 3-amino-1,2-propadienylidene complexes LnM=C=C=C(Ph)NHR* 4 [R* = 2,3,4,6-tetra-O-pivaloyl-β-D-galactopyranosyl] are obtained by the addition of galactopyranosylamine R*-NH2 2 to the corresponding alkynylcarbene complexes LnM=C(OEt)—C≡CPh 1 [LnM = (CO)5Cr, (CO)5W]. Treatment of (Z)-3 with two equivalents of tert-butyl isocyanide (5) affords isocyanide complexes 6 and ketene imines 7. The latter cyclize spontaneously to give galactopyranosylpyrroles 8 which form stable atropisomers 8A and 8B.
Additional Material:
3 Tab.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/cber.19941270423
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