Pseudoephedrine as a Chiral Auxiliary for Asymmetric Michael Reactions: Synthesis of 3-Aryl-δ-lactones
作者:Jacqueline H. Smitrovich、Geneviève N. Boice、Chuanxing Qu、Lisa DiMichele、Todd D. Nelson、Mark A. Huffman、Jerry Murry、James McNamara、Paul J. Reider
DOI:10.1021/ol0259847
日期:2002.5.1
[reaction: see text] The asymmetric Michael reaction of pseudoephedrine amides is reported. The 1,5-dicarbonyl products are converted to 3-aryl-delta-lactones in a two-step reduction/lactonization sequence. This method provides access to enantiomerically enriched trans-3,4-disubstituted delta-lactones.
Michael Reactions of Pseudoephedrine Amide Enolates: Effect of LiCl on Syn/Anti Selectivity
作者:Jacqueline H. Smitrovich、Lisa DiMichele、Chuanxing Qu、Geneviève N. Boice、Todd D. Nelson、Mark A. Huffman、Jerry Murry
DOI:10.1021/jo035564a
日期:2004.3.1
asymmetric Michael reaction of pseudoephedrine amide enolates changes dramatically in the presence of LiCl. Reaction of the enolate in the absence of LiCl results in formation of the antiMichael adduct with high selectivity, whereas in the presence of lithium chloride the syn adduct is favored. This method provides access to enantiomerically enriched trans-3,4-disubstituted δ-lactones from the anti Michael
A reinvestigation of the claisen rearrangement of methyl γ-aryloxycrotonates a convenient synthesis of 3-ethylidenebenzofuran-2(3H)-ones
作者:K. Sunitha、K.K. Balasubramanian
DOI:10.1016/s0040-4020(01)90295-9
日期:1987.1
The synthesis and Claisen rearrangement of methyl γ-aryloxycrotonates have been reinvestigated. A number of methyl γ-aryloxycrotonates have been prepared and sucessfully rearranged to a mixture of Z and E 3-ethylidenebenzofuran-2(3H)ones in refluxing ethylene glycol.
Synthesis and Catalytic Study of Ruthenium Carbene Catalyst Containing a Zn-Porphyrin Ligand
作者:Ying Xu、Huizhu Zhang、Xinyuan Wang、Guiyan Liu
DOI:10.1002/cjoc.201500614
日期:2015.12
A rutheniumcarbene complex containing a Zn‐porphyrin ligand has been developed. The complex was characterized by 1H NMR, IR, HRMS and elemental analysis. The catalytic activity of the rutheniumcarbene complex for olefin metathesis reactions was also investigated. The complex exhibited excellent performance for both ring‐closing and cross metathesis reactions at 35°C.
已开发出含有锌卟啉配体的钌卡宾络合物。该复合物通过1 H NMR,IR,HRMS和元素分析进行表征。还研究了钌卡宾配合物对烯烃复分解反应的催化活性。该复合物在35°C的闭环和交叉易位反应中均表现出出色的性能。
SUNITHA, K.;BALASUBRAMANIAN, K. K., TETRAHEDRON, 43,(1987) N 14, 3269-3278