A direct diastereoselective synthetic approach to useful cyclopropane α-amino acid was established via base-promoted [4 + 2] annulations between o-aminobenzaldehydes and alkyl 2-aroyl-1-chlorocyclopropanecarboxylates. The annulation reaction proceeded quickly under mildly basic conditions, affording α-aminocyclopropanecarboxylic acid derivatives in moderate to excellent yields with high diastereoselectivities
The on-water reaction between 2-(sulfonylamino)-benzaldehydes, isocyanides and pyrrolidine is able to afford a library of poorly synthetically accessible 2-iminoisatins. The pyrrolidine exhibits for the first time the unique role of promoting a triple domino process, i.e. the formation of an N-alkyl-2,3-diaminoindole, the sulfonamide heterolytic N–S bond cleavage, and the hydrolysis of the resulting
One-Pot Trimetallic Relay Catalysis: A Unified Approach for the Synthesis of β-Carbolines and Other [<i>c</i>]-Fused Pyridines
作者:Seema Dhiman、Uttam K. Mishra、S. S. V. Ramasastry
DOI:10.1002/anie.201600840
日期:2016.6.27
for the synthesis of 1,3‐di‐ and 1,3,4‐trisubstituted β‐carbolines through an unprecedented one‐pot triple‐orthogonal‐metal relay catalysis, and 1,3‐disubstituted 4‐hydroxy‐β‐carbolines through a one‐pot bimetallic relay catalysis from readily accessible 3‐(2‐aminophenyl)‐5‐hexenyn‐3‐ols. These strategies were elaborated to enable the synthesis of benzofuro[2,3‐c]pyridines, benzothieno[2,3‐c]pyridines
提出了一种通过空前的一锅三正交金属中继催化合成1,3-二取代和1,3,4-三取代的β-咔啉和1,3-二取代的4-羟基通过容易获得的3-(2-氨基苯基)-5-hexenyn-3-ols通过一锅双金属中继催化作用生成β-咔啉。精心设计了这些策略,可以合成苯并呋喃[2,3- c ]吡啶,苯并噻吩并[2,3- c ]吡啶和异喹啉,否则需要多步合成。
Asymmetric Auto‐Tandem Palladium Catalysis for 2,4‐Dienyl Carbonates: Ligand‐Controlled Divergent Synthesis
The diastereodivergent assembly of polyhydro-1,6-naphthyridines from o-TosylNH aldimines and 2,4-dienyl carbonates has been realized by ligand-controlled auto-tandem palladium catalysis, through an N-allylation, vinylogous addition, π-σ-π isomerization, and N-allylation cascade. Further tuning of the ligands even allowed regiodivergent azetidine or chemodivergent β-H elimination products to be obtained
Organocatalytic Asymmetric Synthesis of Tetrahydroquinolines from <i>ortho</i>-Aminophenyl <i>para</i>-Quinone Methides
作者:Fengbiao Luo、Hao Dong、Weiwu Ren、Yang Wang
DOI:10.1021/acs.orglett.2c02874
日期:2022.10.28
The asymmetric catalytic [4 + 2] cycloannulation of ortho-aminophenyl p-QMs with different types of alkenes for the construction of tetrahydroquinolines containing three contiguous stereogenic centers was developed. This is the first example of catalytic asymmetric cycloannulation of ortho-aminophenyl p-QMs. This reaction exhibits excellent functional group tolerance. Excellent yields, exclusive d