Enantioselective Synthesis of Hemiaminals via Pd-Catalyzed C–N Coupling with Chiral Bisphosphine Mono-oxides
摘要:
A novel approach to hemiaminal synthesis via palladium-catalyzed C-N coupling with chiral bisphosphine mono-oxides is described. This efficient new method exhibits a broad scope, provides a highly efficient synthesis of HCV drug candidate elbasvir, and has been applied to the synthesis of chiral N,N-acetals.
Studies on the Bisoxazoline- and (−)-Sparteine-Mediated Enantioselective Addition of Organolithium Reagents to Imines
作者:Scott E. Denmark、Noriyuki Nakajima、Cory M. Stiff、Olivier J.-C. Nicaise、Michael Kranz
DOI:10.1002/adsc.200800017
日期:2008.5.5
The enantioselective addition of organolithiumreagents to N-anisyl aldimines promoted by chiral bisoxazolines and (-)-sparteine as external ligands is described. This reaction proceeds readily with a wide range of aldimine substrates (aliphatic, aromatic, olefinic) and organolithium nucleophiles (Me, n-Bu, Ph, vinyl) in excellent yields (81-99%) and with high enantioselectivities (up to 95.5:4.5 er)
Asymmetric Petasis Borono‐Mannich Allylation Reactions Catalyzed by Chiral Biphenols
作者:Yao Jiang、Scott E. Schaus
DOI:10.1002/anie.201611332
日期:2017.2
Chiral biphenols catalyze the asymmetric Petasis borono‐Mannich allylation of aldehydes and amines through the use of a bench‐stable allyldioxaborolane. The reaction proceeds via a two‐step, one‐pot process and requires 2–8 mole % of 3,3′‐Ph2‐BINOL as the optimal catalyst. Under microwave heating the reaction affords chiral homoallylic amines in excellent yields (up to 99 %) and high enantioselectivies
A three-component reaction of aldehydes, amines and allyltributylstannane was efficiently carried out to afford the corresponding homoallylicamine derivatives in the presence of 20 mol% of MgI2 etherate [(MgI2*(OEt2) n ] under mild and neutral reaction conditions in good to excellent yields.
在温和和中性反应条件下,在 20 mol% MgI2 醚合物 [(MgI2*(OEt2) n ] 的存在下,醛、胺和烯丙基三丁基锡烷的三组分反应得到了相应的高烯丙基胺衍生物。优良的产量。
Development of a General Protocol To Prepare 2<i>H</i>-1,3-Benzoxazine Derivatives
作者:Ji Qi、Steven F. Oliver、Wensong Xiao、Licheng Song、Karel M. J. Brands
DOI:10.1021/acs.oprd.7b00209
日期:2017.10.20
A practical synthesis and detailed development process of 2H-1,3-benzoxazine derivatives catalyzed by aldimine and trifluoromethanesulfonicacid is described. A broad range of substrates with diverse steric and electronic properties were explored. Aliphatic/aromatic/heteroaromatic substrates all proceed well under conditions which have been optimized into a robust, scalable process.
描述了一种实用的合成方法和详细的开发过程,该方法由亚胺和三氟甲磺酸催化合成2 H -1,3-苯并恶嗪衍生物。探索了具有不同空间和电子特性的各种基材。脂肪/芳族/杂芳族底物在已优化为强大,可扩展的工艺的条件下均能很好地进行。