共 11 条
ORGANIC SYNTHESES VIA TRANSITION-METAL COMPLEXES .62. 1ST CARBENE COMPLEXES (M = CR, W) WITH CARBOHYDRATE SUBSTITUENTS
被引:42
作者:
AUMANN, R
机构:
[1] Organisch-Chemisches Institut, Universität Münster, Münster, W-4400
来源:
CHEMISCHE BERICHTE-RECUEIL
|
1992年
/
125卷
/
12期
关键词:
CARBENE COMPLEXES OF CARBOHYDRATE DERIVATIVES;
VINYLCARBENE CHROMIUM AND TUNGSTEN COMPLEXES;
DELTA-D-MANNOFURANOSIDES, 2,3-5,6-DI-O-ISOPROPYLIDENEFURANOSIDES, OF CARBENE COMPLEXES;
ALPHA-D-ALLOFURANOSIDES, 1,2-5,6-DI-O-ISOPROPYLIDENEFURRANOSIDES, OF CARBENE COMPLEXES;
ALPHA-D-GLUCOFURANOSIDES, 1,2-5,6-DI-O-ISOPROPYLIDENESFURANOSIDES, OF CARBENE COMPLEXES;
1,2-PROPADIENYLIDEN TUNGSTEN COMPLEX;
D O I:
10.1002/cber.19921251224
中图分类号:
O6 [化学];
学科分类号:
0703 ;
摘要:
The first examples of transition metal carbene complexes of carbohydrate derivatives are described: 1,2:5,6-Di-0-isopropyliden-alpha-D-glucofuranose (2a), 1,2:5,6-di-O-isopropylidene-alpha-D-allofuranose (2b), and 2,3:5,6-di-0-isopropyliden-alpha-D-mannofuranose (2c) add regiospecifically at C-3 of alkynylcarbene complexes L(n) = C(OEt) - C = CPh 1 [L(n)M = Cr(CO)5 (a), W(CO)5 (b)] to give vinylcarbene complexes L(n)M = C(OEt) - CH = C(Ph) - O(sugar) (E/Z)-3a-g in good to excellent yields. As a minor side reaction the alkynyl carbene complex (CO)5W = C(OEt) - C = CPh (1 b) isomerises to give the 1,2-propadienylidene complex (CO)5W = C = C = C(OEt)C6H5 (4 b).
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页码:2773 / 2778
页数:6
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