The First One-Pot Synthesis of Morita-Baylis-Hillman Adducts Starting Directly from Alcohols
作者:Lal Yadav、Vishnu Srivastava、Rajesh Patel
DOI:10.1055/s-0029-1219577
日期:2010.4
The first example of one-pot oxidative carbon-carbon bond formation via the Morita-Baylis-Hillman reaction using alcohols is reported. The protocol involves silica gel-DABCO catalyzed oxidation of alcohols to aldehydes with chloramine-T followed by their Morita-Baylis-Hillman reaction with acrylonitrile or methyl acrylate to give 70-87% overall yields of the corresponding Morita-Baylis-Hillman adducts
Various phenyl and p‐tolyl allyl sulfonederivatives were prepared stereoselectively by reacting BaylisHillman acetates with sodium 4‐R‐benzenesulfinate (R=H, Me) in H2O. The reaction was very efficient in providing the corresponding sulfonederivatives in good to excellent yields (Table).
Dess-Martin Periodinane Promoted Oxidative Coupling of Baylis-Hillman Adducts with Silyl Enol Ethers: A Novel Synthesis of <i>cis</i>-Fused Dihydropyrans
enol ethers in the presence of Dess-Martin periodinane (DMP) and pyridine under mild reaction conditions to afford a new class of dihydropyranderivatives in good yields with high diastereoselectivity. This is the first report on the preparation of cis-fused dihydropyransfrom Baylis-Hillman adducts and silyl enol ethers.
regio‐ and enantioselective allylic amination of aliphatic Morita‐Baylis–Hillman (MBH) adducts with N‐heteroaromatic nucleophiles (e.g., benzimidazole, 4,5‐diphenylimidazole, benzotriazole, and purines) was achieved by using a spiroketal‐based diphosphine (SKP) ligand, and afforded a range of chiral, branched N‐allyl products with high selectivity.
Control of Chemo-, Regio-, and Enantioselectivity in Copper Hydride Reductions of Morita–Baylis–Hillman Adducts
作者:Roscoe T. H. Linstadt、Carl. A. Peterson、Carina I. Jette、Zarko V. Boskovic、Bruce H. Lipshutz
DOI:10.1021/acs.orglett.6b03464
日期:2017.1.20
Nonracemically ligated copper hydride can be used to effect tandem SN2′/1,2-reductions of racemic Morita–Baylis–Hillman (MBH) acetates to access enantioenriched chiral allylic alcohols with defined olefin geometry. MBH esters, including those with β-substitution, can be transformed to stereodefined enoates by taking advantage of a bulky, oligomeric, in situ generated trialkoxysiloxane leaving group
非消旋连接的氢化铜可用于串联S N 2'/ 1,2-还原外消旋的森田-贝利斯-希尔曼(MBH)乙酸酯,以得到具有定义的烯烃几何形状的对映体富集的手性烯丙基醇。MBH酯(包括具有β取代基的酯)可以利用庞大的,低聚的,原位生成的三烷氧基硅氧烷离去基团转化为立体定义的烯酸酯。最后,公开了容易到达的MBH醇衍生物向非外消旋烯丙基醇的非典型转化。