The regiospecific nucleophilic substitution during the ruthenium catalyzed allylicalkylation of 1,3-unsymmetrical disubstituted allylic esters was demonstrated. The nucleophile was selectively introduced at the position originally substituted with leaving group in the 2-DPPBA or ip-pybox ligated [RuCl2(p-cymene)]2 catalyzed allylicalkylation of 1,3-unsymmetrical disubstituted allylic esters. The
Enantioselective Synthesis of Vicinal All‐Carbon Quaternary Centers via Iridium‐Catalyzed Allylic Alkylation
作者:J. Caleb Hethcox、Samantha E. Shockley、Brian M. Stoltz
DOI:10.1002/anie.201804820
日期:2018.7.9
development of the first enantioselective transition‐metal‐catalyzedallylicalkylation providing access to acyclic products bearing vicinal all‐carbonquaternarycenters is disclosed. The iridium‐catalyzedallylicalkylation reaction proceeds with excellent yields and selectivities for a range of malononitrile‐derived nucleophiles and trisubstituted allylic electrophiles. The utility of these sterically congested
A highlydiastereo- and enantioselectivecyclopropanation reaction was realized in the reaction of acyclic amides with monosubstituted allyl carbonates via Pd-catalysis using a ferrocene ligand with H as a substituent on an oxazoline ring, providing cyclopropane products having three chiral centers in yields of 67-83%, the dr ratio being 4-23:1, and ee being 83-97%. The presence of LiCl is important
[EN] COMPOSITIONS AND METHODS FOR PREPARING β,γ-UNSATURATED ACIDS<br/>[FR] COMPOSITIONS ET PROCÉDÉS POUR LA PRÉPARATION D'ACIDES β,γ-INSATURÉS
申请人:CALIFORNIA INST OF TECHN
公开号:WO2018209243A1
公开(公告)日:2018-11-15
The present disclosure provides methods for enantioselective synthesis of acyclic α- quaternary carboxylic acid derivatives via iridium-catalyzed allylic alkylation.