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Sparteine complexes of lithiated primary O-2-alkenyl carbamates stereochemistry of the lithium-titanium exchange and application for the synthesis of enantiomerically enriched γ-lactones
作者:Oliver Zschage、Dieter Hoppe
DOI:10.1016/0040-4020(92)80016-9
日期:1992.7
(−)-sparteine complex from 1-lithio-2-butenyl N,N-diisopropylcarbamate has (S)-configuration at the metal bearing carbon atom, in contrary to our previous assumption. Transmetallation with titanium tetraisopropoxide and the carboxylation proceed with inversion. The addition of aldehydes occurs in a anti-SE′-process. The enantioselective synthesis of homoaldol adducts and some corresponding γ-lactones is reported
与我们先前的假设相反,由1-硫代-2-丁烯基N,N-二异丙基氨基甲酸酯优先形成的(-)-天冬氨酸络合物在带有金属的碳原子上具有(S)-构型。用四异丙氧基钛进行金属转移和羧化反应进行转化。在加入醛的发生在抗-S E' -Process。据报道,高聚物加合物和一些相应的γ-内酯的对映选择性合成。
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Hoppe, Dieter; Zschage, Oliver, Angewandte Chemie, 1989, vol. 101, # 1, p. 67 - 69
作者:Hoppe, Dieter、Zschage, Oliver
DOI:——
日期:——
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Hoppe, Dieter; Tarara, Gerhard; Wilckens, Marcus, Angewandte Chemie, 1987, vol. 99, # 10, p. 1079 - 1081
作者:Hoppe, Dieter、Tarara, Gerhard、Wilckens, Marcus、Jones, Peter G.、Schmidt, Dieter、Stezowski, John J.
DOI:——
日期:——
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Hoffmann, Reinhard W.; Lanz, Joachim; Metternich, Rainer, Angewandte Chemie, 1987, vol. 99, # 11, p. 1196 - 1197
作者:Hoffmann, Reinhard W.、Lanz, Joachim、Metternich, Rainer、Tarara, Gerhard、Hoppe, Dieter
DOI:——
日期:——
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HOPPE, DIETER;TARARA, GERHARD;WILCKENS, MARCUS;JONES, PETER G.;SCHMIDT, D+, ANGEW. CHEM., 99,(1987) N 10, 1079-1081
作者:HOPPE, DIETER、TARARA, GERHARD、WILCKENS, MARCUS、JONES, PETER G.、SCHMIDT, D+
DOI:——
日期:——