CHIRAL DIENE LIGANDS, A FABRICATION METHOD THEREOF AND APPLICATIONS THEREOF
申请人:WU Hsyueh-Liang
公开号:US20130096348A1
公开(公告)日:2013-04-18
The present invention proposes a chiral diene ligand, a fabrication method thereof and applications thereof. The chiral diene ligand is a bicyclo[2.2.1] diene ligand having structural specificity and high stability, which favors the bicyclo[2.2.1] diene ligand to take part in asymmetric transformations, particularly an asymmetric addition reaction involving a metal catalyst in a basic environment. Most of the products of the reactions implemented by the chiral diene ligands of the present invention have superior optical activity. The method of the present invention comprises a first oxidation step, a saponification step, a second oxidation step, a deprotonation step, and a cross-coupling step. The chiral diene ligand of the present invention is very suitable to be used in the fabrication or synthesis of various chemicals and medical products.
The present invention discloses a method for preparation of Apremilast. β-phthalimino vinylsulfones are reacted through the asymmetric addition reaction to form an addition product, and the drug of Apremilast can be obtained from the addition product through simple reactions. The method is a process for synthesizing Apremilast in a more efficient way.
Highly Enantioselective Rhodium-Catalyzed Asymmetric 1,4-Addition Reactions of Arylboronic Acids to Acyclic α,β-Unsaturated Compounds: The Formal Synthesis of (−)-Indatraline
were synthesized from (−)‐5‐oxobornyl acetate and utilized in the asymmetric 1,4‐addition reaction of arylboronic acids with acyclic α,β‐unsaturated compounds. Low catalytic loading of the complex, generated in situ from 1 and [RhCl(C2H4)2}2], provides adducts in good to excellent yields and excellent enantioselectivities. This method was used for the formal total synthesis of (−)‐indatraline.
是做二烯就是做的:稳定的手性双环[2.2.1]二烯配体是由(-)-5-氧代冰片乙酸酯合成的,用于芳基硼酸与无环α,β-不饱和化合物的不对称1,4加成反应。由1和[RhCl(C 2 H 4)2 } 2 ]原位生成的络合物的低催化负载量提供了良好至优异收率和优异对映选择性的加合物。该方法用于(-)-茚达林的正式全合成。
(+)-syn-Benzotriborneol: the first functionalised enantiopure C3-symmetric benzocyclotrimer
作者:Fabrizio Fabris、Luca Bellotto、Ottorino De Lucchi
DOI:10.1016/s0040-4039(02)02789-2
日期:2003.2
Copper(I) thiophencarboxylate readily and effectively cyclotrimerises protected 5-bromo-6-trimethylstannylborn-5-en-2-ols, leading to oxygen-functionalised benzocyclotrimers. The remarkably high syn to anti ratio is driven by relative displacement of the halide and metal on the alkene moiety and depends on the steric hindrance of the protecting group of the hydroxy function. The less hindered methyl
Enantiospecific Synthesis of Both Enantiomers of the Longtailed Mealybug Pheromone and Their Evaluation in a New Zealand Vineyard
作者:Remya Ramesh、Vaughn Bell、Andrew M. Twidle、Rajesh Gonnade、D. Srinivasa Reddy
DOI:10.1021/acs.joc.5b01131
日期:2015.8.7
from the corresponding bornylacetates. The use of readily accessible chiral starting materials and lactone–lactone rearrangement are the highlights of the present synthesis. The biological activities of the two enantiomers and racemic mixture were tested in a New Zealand vineyard. The (S)-(+)-enantiomer was significantly more attractive to P. longispinus males than the racemic mixture or the (R)-(−)-enantiomer