Temperature dependent 1H NMR study of the substrate complex derived from zinc(II) perchlorate, (R,R)-4,6-dibenzofurandiyl-2,2′-bis(4-phenyloxazoline), and 3-acetyl-2-oxazolidinone.: Evidence for octahedral structure of the substrate complex

被引：19

作者：

Kanemasa, S ^{[1
]}

Oderaotoshi, Y

Tanaka, J

Wada, E

机构：

[1] Kyushu Univ, Inst Adv Mat Study, Kasuga, Fukuoka 8168580, Japan

[2] Kyushu Univ, Dept Mol Sci & Technol, Interdisciplinary Grad Sch Engn Sci, Kasuga, Fukuoka 8168580, Japan

来源：

TETRAHEDRON LETTERS | 1998年 / 39卷 / 41期

关键词：

D O I：

10.1016/S0040-4039(98)01635-9

中图分类号：

O62 [有机化学];

学科分类号：

070303 ; 081704 ;

摘要：

Temperature dependent H-1 NMR study has been:performed on the substrate complex derived from zinc(II) perchlorate, (R,R)-4,6-dibenzofurandiyl-2,2'-bis(4-phenyloxazoline), and 3-acetyl-2-oxazolidinone in deuteriodichloromethane. At room temperature, two isomers of octahedral substrate complexes are rapidly exchanging through a trigonal bipyramid intermediate. Liberation of the DBFOX/Ph ligand from the substrate complex can not be observed in a wide range of temperature, showing high stability of the DBFOX/Ph . Zn(ClO4)(2) complex. (C) 1998 Elsevier Science Ltd. All rights reserved.

引用

页码：7521 / 7524

页数：4

共 3 条

[1] Asymmetric cycloaddition reactions catalyzed by transition metal complexes - New guidelines for structural design of chiral catalyst [J].

Kanemasa, S ;

Oderaotoshi, Y .

JOURNAL OF SYNTHETIC ORGANIC CHEMISTRY JAPAN, 1998, 56 (05) :368-376

[2] Cationic aqua complexes of the C-2-symmetric trans-chelating ligand (R,R)-4,6-dibenzofurandiyl-2,2'-bis(4-phenyloxazoline). Absolute chiral induction in Diels-Alder reactions catalyzed by water-tolerant enantiopure Lewis acids [J].

Kanemasa, S ;

Oderaotoshi, Y ;

Yamamoto, H ;

Tanaka, J ;

Wada, E ;

Curran, DP .

JOURNAL OF ORGANIC CHEMISTRY, 1997, 62 (19) :6454-6455

[3] Transition-metal aqua complexes of 4,6-dibenzofurandiyl-2,2′-bis(4-phenyloxazoline).: Effective catalysis in Diels-Alder reactions showing excellent enantioselectivity, extreme chiral amplification, and high tolerance to water, alcohols, amines, and acids [J].

Kanemasa, S ;

Oderaotoshi, Y ;

Sakaguchi, S ;

Yamamoto, H ;

Tanaka, J ;

Wada, E ;

Curran, DP .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1998, 120 (13) :3074-3088

← 1 →