An Efficient Means for Generating <i>p</i>-Methoxybenzyl (PMB) Ethers under Mildly Acidic Conditions
作者:Leo Paquette、Catherine Stewart、Xiaowen Peng
DOI:10.1055/s-2008-1032132
日期:2008.2
The protection of a wide variety of alcohols as their p-methoxybenzyl ethers can be performed with PMBO-lepidine in the presence of methyl tosylate or, preferably, camphorsulfonic acid. No inorganic promoters are required, thereby facilitating workup and product isolation.
Catalytic Direct Nucleophilic Substitution of Primary Morita–Baylis–Hillman Adducts and Application to the Straightforward Synthesis of Dihydroisoindolones
iron/boron-catalyzed direct nucleophilicsubstitution of functionalized primary allylic alcohols with a large variety of nucleophiles. The resulting substitution products are useful synthetic platforms for heterocycle synthesis, as illustrated in a ready access to tetrahydroisoindol-4-ones. An interesting γ-carbonyl effect permits the dual iron/boron-catalyzed direct nucleophilicsubstitution of functionalized
Asymmetric Synthesis of 2,3‐Disubstituted Cyclic Ketones by Enantioselective Conjugate Radical Additions
作者:Sukanya Nad、Mukund P. Sibi
DOI:10.1002/hlca.201900223
日期:2019.12
Enantioselectiveconjugate radical addition to 2‐acyloxymethyl cycloalkenones proceeds in high yield with outstanding diastereoselectivity and excellent enantioselectivity using chiral salen Lewis acids. The process provides access to 2,3‐disubstituted cycloalkanones, a structural motif present in natural products.