CAMPHOR-DERIVED COMPOUNDS, METHOD FOR MANUFACTURING THE SAME, AND APPLICATION THEREOF
申请人:UANG Biing-Jiun
公开号:US20120077976A1
公开(公告)日:2012-03-29
Camphor-derived compounds are disclosed, which are represented as the following formula (I):
wherein R
1
, R
2
, R
3
, and R
4
each are defined as described in the specification. In addition, a method for manufacturing the camphor-derived compounds and application thereof are disclosed.
Nickel-Catalyzed Isomerization/Allylic Cyanation of Alkenyl Alcohols
作者:Ying Ding、Jinguo Long、Feilong Sun、Xianjie Fang
DOI:10.1021/acs.orglett.1c02143
日期:2021.8.6
Herein reported is a nickel-catalyzed isomerization/allylic cyanation of alkenyl alcohols, which complements current methods for the allylic substitution reactions. The specific diphosphite ligand and methanol as the solvent are crucial for the success for this transformation. A gram-scale regioconvergent experiment and formal synthesis of quebrachamine demonstrate the high potential of this methodology
Remarkably simple IrIII catalysts enable the isomerization of primary and sec‐allylicalcohols under very mild reaction conditions. X‐ray absorption spectroscopy (XAS) and mass spectrometry (MS) studies indicate that the catalysts, with the general formula [Cp*IrIII], require a halide ligand for catalytic activity, but no additives or additional ligands are needed.
非常简单的Ir III催化剂可在非常温和的反应条件下实现伯醇和仲烯丙基醇的异构化。X射线吸收光谱(XAS)和质谱(MS)研究表明,通式为[Cp * Ir III ]的催化剂需要卤化物配体才能发挥催化活性,但不需要添加剂或其他配体。
Chiral ligands derived from abrine. Part 7: Effect of O, S, N in aromatic ring substituents at C-1 on enantioselectivity induced by tetrahydro-β-carboline ligands in diethylzinc addition to aldehydes
The effect of O, S and N atoms in aromatic ring substituents at C-1 position of tetrahydro-β-carboline ligands on the enantioselectivity of diethylzincadditions to benzaldehyde was studied when esters or tertiary alcohol functions were present at C-3. A mechanism is proposed to explain why the ester ligands 2c and 2d, in which the pyridyl N atom is at C′-2 in 2c and at C′-3 in 2d, catalyzed the addition
当在C-3处存在酯或叔醇官能团时,研究了四氢-β-咔啉配体的C-1位芳香环取代基中的O,S和N原子对二乙基锌加成苯甲醛的对映选择性的影响。提出了一种机制来解释为什么吡啶基N原子位于2c的C'-2和位于2d的C'-3的酯配体2c和2d催化二乙基锌与苯甲醛的加成反应而形成(R) -和(S1-苯基-1-丙醇的β-对映体。还提出了一种解释,即在添加二乙基锌期间,叔醇3c诱导的中等对映选择性与3d诱导的非常小的对映选择性(在C-1处具有3-吡啶基功能)有关。C-1处的-CH 2 - t -Bu取代基导致很高的对映选择性。
Catalytic Enantioselective β-Alkylation of α,β-Unsaturated Aldehydes by Combination of Transition-Metal- and Aminocatalysis: Total Synthesis of Bisabolane Sesquiterpenes
aldehydes by combination of simple chiral amine and copper catalysts provides β‐branched aldehydes in a one‐pot protocol (see scheme). The methodology was applied to the short total syntheses of bisabolanesesquiterpenes (S)‐(+)‐curcumene, (E)‐(S)‐(+)‐3‐dehydrocurcumene and (S)‐(+)‐tumerone.