Stereospecific coordination ofl-hydroxyproline esters with triosmium clusters期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Stereospecific coordination ofl-hydroxyproline esters with triosmium clusters

Authors:	V. A. Maksakov V. P. Kirin A. V. Golovin

Affiliation:	(1) Siberian Branch of the Russian Academy of Sciences, Institute of Inorganic Chemistry, 3 prosp. Akad. Lavrent'eva, 630090 Novosibirsk, Russian Federation;(2) Siberian Branch of the Russian Academy of Sciences, G. K. Boreskov Institute of Catalysis, 5 prosp. Akad. Lavrent'eva, 630090 Novosibirsk, Russian Federation

Abstract:	The reactions of cluster (-H)Os₃(CO)₁₀(-OH) with ethyl and isopropyl esters ofl-oxyproline were studied. In the presence of Me₃NO intermediate complex (-H)Os₃(CO)₉(-OH)L (L — isopropyl ester ofl-oxyproline) is formed, which slowly converts to the more stable cluster (-H)Os₃(CO)₉ $left{ {mu ,eta ^2 } right.--{rm O}\|overline {CHCH_2 CH(COOPr^i )NH} mathop Climits^\| left. {H_2 } right}$ . Cluster complexes containing chelate-bridging heterocycles were also obtained by heating (-H)Os₃(CO)₁₀(-OH) with esters ofl-oxyproline. In both cases, only one of the possible diastereomeric complexes (-H)Os₃(CO)₉ $left{ {mu ,eta ^2 } right.--{rm O}\|overline {CHCH_2 CH(COOPr^i )NH} mathop Climits^\| left. {H_2 } right}$ (R = Et, Prⁱ) is formed, which indicates that the reactions are stereospecific. Based on analysis of Dreiding's models, an attempt to determine the absolute configuration of the obtained clusters was made.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 10, pp. 2021–2025, October, 1995.

Keywords:	triosmium clusters l-hydroxyproline esters stereospecific coordination
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