The first asymmetricorganocatalyticallylicalkylation of 1,2-dihydro-Reissert compounds and Morita–Baylis–Hillman (MBH) carbonates has been developed, which provided a novel protocol to construct enantioenriched functionalized 1,2-dihydroisoquinolines bearing vicinal quaternary and tertiary chiral centers at C-1 position (up to 94% ee, dr > 20 : 1).
Acylation of Baylis-Hillman carbonates by visible light catalysis has been reported. Acyl radical is produced by decarboxylation of α-keto acid. This method has mild conditions, wide substrate scope, good functional group tolerance, and moderate to good yield, which provides a new route for the acylation of Baylis-Hillman derivatives.
Highly Enantioselective and Regioselective Substitution of Morita–Baylis–Hillman Carbonates with Nitroalkanes
作者:Guo-Ying Chen、Fangrui Zhong、Yixin Lu
DOI:10.1021/ol202555v
日期:2011.11.18
A highly enantioselective and regioselectivesubstitution reaction of the Morita–Baylis–Hillman (MBH) carbonates with nitroalkanes catalyzed by a quinidine-derived tertiary amine–thiourea catalyst has been developed. The described method, which is different from most organocatalytic allylicsubstitutions of the MBH adducts to date, represents a novel approach to regioselectively functionalize the MBH
Catalytic Enantioselective Vinylogous Allylic Alkylation of Coumarins
作者:Satavisha Kayal、Santanu Mukherjee
DOI:10.1021/acs.orglett.7b02421
日期:2017.9.15
An unprecedented, organocatalytic enantioselective vinylogous γ-allylic alkylation of 4-methylcoumarins has been developed. Using allylic carbonates as the allyl source, this reaction is catalyzed by Lewis basic dimeric Cinchona alkaloid (QD)2PHAL and proceeds exclusively in a γ- and branched-selective manner to produce densely functionalized coumarin derivatives generally in good yields with good
In this paper, phosphine‐catalyzed [3 + 3] annulation of Morita–Baylis–Hillman carbonates with C,N‐cyclic azomethine imines has been achieved. The reaction worked smoothly under mild conditions to afford 4,6,7,11b‐tetrahydro‐1H‐pyridazino[6,1‐a]isoquinoline derivatives in high yields with good to excellent diastereoselectivities.