Carbamate-directed stereoselective hydrogenation and kinetic resolution of N-protected α-(α-aminoalkyl)acrylates
作者:Masatoshi Takagi、Keiji Yamamoto
DOI:10.1016/s0040-4020(01)81001-2
日期:1991.10
addition, the relative rate ratio, kR/kS, of a kineticresolution during the Ru-catalyzed hydrogenation was found to be in a range 8–17, varying rather randomly as the alkyl group in 1 altered. The intercorrelation between the diastereoselectivity by virtue of the substrate-control and the kinetic discrimination of (±)-1 arising from the chiral catalyst-control was discussed in one particular case.
使用多种含有二膦和手性[Ru(OAc)2(S)-BIHAP]的Rh(I)阳离子络合物,将一系列外消旋甲基α-[α-(甲氧基羰基氨基)烷基]丙烯酸酯(1a-e)氢化( BINAP = 2,2'-双(二苯基膦基)-1,1'-二萘基)作为催化剂前体,优先提供苏式异构体(2a-d),其非对映异构体选择性主要取决于1中的烷基。此外,发现Ru催化加氢过程中动力学拆分的相对速率比k R / k S在8-17范围内,随着烷基在1中的变化而随机变化。改变了。在一种特定情况下,讨论了通过底物控制的非对映选择性与由手性催化剂控制引起的(±)-1动力学区分之间的相互关系。
Selective Formation of α-Methylene-β-amino acid Derivatives through the Aza Version of the Baylis−Hillman Reaction
作者:Daniela Balan、Hans Adolfsson
DOI:10.1021/jo0158635
日期:2001.9.1
Rearrangements and Intramolecular Diels−Alder Reactions of Normal and Vinylogous Aza-Morita−Baylis−Hillman Products Leading to Isoindoline Derivatives
作者:Kristen N. Clary、Masood Parvez、Thomas G. Back
DOI:10.1021/jo1005087
日期:2010.6.4
one case, only the former products were observed in the presence of methylaluminum dichloride, while the corresponding aromatized isoindolines were obtained when the IMDA reactions were carried out in the presence of DDQ. Thus, a variety of aryl-substituted isoindoline products with different levels of unsaturation and complementary substitution patterns and stereochemistry are readily available through