Pd-Catalyzed Allylation of Imines to Access α-CF<sub>3</sub>
-Substituted α-Amino Acid Derivatives
作者:Michael Winter、Hyunwoo Kim、Mario Waser
DOI:10.1002/ejoc.201901272
日期:2019.11.14
herein report a high yielding protocol for the direct α‐allylation of easily accessible trifluoropyruvate‐derived imines using Pd‐catalysis. The reaction gives access to a variety of different α‐allylated‐α‐CF3‐amino acids in a straightforward manner, starting from commercially available trifluoropyruvate. We also provide a proof‐of‐concept for an enantioselective protocol (up to er = 75:25) by using
我们在此报告了一种使用 Pd 催化将易于获得的三氟丙酮酸衍生亚胺直接 α-烯丙基化的高产方案。该反应从市售的三氟丙酮酸开始,以直接的方式获得各种不同的 α-烯丙基化-α-CF3-氨基酸。我们还通过使用手性磷烷配体为对映选择性协议(高达 er = 75:25)提供了概念验证。
Asymmetric γ-Allylation of α,β-Unsaturated Aldehydes by Combined Organocatalysis and Transition-Metal Catalysis
作者:Line Naesborg、Kim Søholm Halskov、Fernando Tur、Sofie M. N. Mønsted、Karl Anker Jørgensen
DOI:10.1002/anie.201504749
日期:2015.8.24
The first asymmetric regio‐ and diastereodivergent γ‐allylation of cyclic α,β‐unsaturated aldehydes based on combined organocatalysis and transition‐metal catalysis is disclosed. By combining an aminocatalyst with an iridium catalyst, both diastereomers of branched allylated products can be achieved in moderate to good yields and excellent regio‐ and stereoselectivities. Furthermore, by replacing the
C–C bond-forming reactions using Katritzky salts, their deaminative allylation remains a challenge. Inspired by the metallaphotoredox-catalyzed allylicsubstitution regime, here, we report the deaminative allylation of Katritzky salts via cobalt/organophotoredox dual catalysis. This cross-electrophile coupling enables regioselective allylation using a variety of allylic esters, overcoming the substrate
An efficient Pd‐catalyzedthree‐componentcoupling reaction of allyl carboxylates, norbornenes and diboronates is described, which allows efficient assembly of C(sp3)—C(sp3) and C(sp3)—B bonds in a single process. Moreover, this approach shows advantages of good chemo‐ and regioselectivity, as well as good substrates suitability.
Stereodivergent Construction of 1,3‐Chiral Centers via Tandem Asymmetric Conjugate Addition and Allylic Substitution Reaction
作者:Jia‐Hao Xie、Yi‐Ming Hou、Zuolijun Feng、Shu‐Li You
DOI:10.1002/anie.202216396
日期:2023.3
cyclohexanones bearing multi-continuous stereocenters by combining copper-catalyzed asymmetric conjugate addition of dialkylzinc reagents to cyclic enones with iridium-catalyzed asymmetric allylicsubstitution reaction. Good to excellent yields, diastereoselectivity and enantioselectivity can be obtained. The current reaction can achieve the stereodivergent construction of nonadjacent stereocenters.