Organoselenium-Catalyzed, Hydroxy-Controlled Regio- and Stereoselective Amination of Terminal Alkenes: Efficient Synthesis of 3-Amino Allylic Alcohols
摘要:
An efficient route to prepare 3-amino allylic alcohols in excellent regio- and stereoselectivity in the presence of bases by orangoselenium catalysis has been developed. In the absence of bases alpha,beta-unsaturated aldehydes were formed in up to 97% yield. Control experiments reveal that the hydroxy group is crucial for the direct amination.
Pyrolysis of allyl ethers. Unimolecular fragmentation to propenes and carbonyl compounds
作者:R. C. Cookson、S. R. Wallis
DOI:10.1039/j29660001245
日期:——
about 500° allylethers undergo decomposition through a cyclic, six-atom transition state with transfer of a hydrogen atom to give high yields of a carbonylcompound and a propene, in which the double bond has moved from the 2,3- to the 1,2-position of the allyl system. The rate of reaction is rather insensitive to structural variation in either the allyl or alkyl part of the ether. Allyl α-deuterodiphenylmethyl
A synthetic method for N-protected allylic amines from allyl ethers using chlorosulfonyl isocyanate (CSI) is presented. The reaction of 4-phenylbut-2-enyl methyl ether (1i) with CSI afforded methyl N-(1-benzylallyl)carbamate (2i) and methyl N-(4-phenylbut-2-enyl)carbamate (3i) in a 1:1.1 ratio. On the other hand, 1-benzylallyl methyl ether (1k) afforded the same products in a 4.6:1 ratio. The reactions
Rhodium-Catalyzed Enantioselective Intermolecular Hydroalkoxylation of Allenes and Alkynes with Alcohols: Synthesis of Branched Allylic Ethers
作者:Zi Liu、Bernhard Breit
DOI:10.1002/anie.201603538
日期:2016.7.11
Regio‐ and enantioselective additions of alcohols to either terminal allenes or internal alkynes provides access to allylic ethers by using a RhI/diphenyl phosphate catalytic system. This method provides an atom‐economic way to obtain chiral aliphatic and aryl allylic ethers in moderate to good yield with good to excellent enantioselectivities.
通过末端Rh I /二苯基磷酸酯催化系统,将醇的区域和对映体选择性加成到末端异戊烯或内部炔烃中,即可获得烯丙基醚。该方法提供了一种原子经济的方法,可以以中等至良好的收率以及良好至优异的对映选择性获得手性脂肪族和芳基烯丙基醚。
Intermolecular Regioselective 1,2-Diamination of Allylic Ethers
作者:Kilian Muñiz、Jonathan Kirsch、Patricia Chávez
DOI:10.1002/adsc.201000813
日期:2011.3.28
Homogeneous palladium catalysis enables a novel intermolecularregioselective diamination of allylicethers, which offers a convenient entry into 1,2,3‐trisubstituted products. These represent suitable building blocks with differently protected nitrogen atoms for subsequent synthetic application.
Highly Regioselective Pd-Catalyzed Intermolecular Aminoacetoxylation of Alkenes and Evidence for <i>cis</i>-Aminopalladation and S<sub>N</sub>2 C−O Bond Formation
作者:Guosheng Liu、Shannon S. Stahl
DOI:10.1021/ja061706h
日期:2006.6.1
of alkenes with phthalimide as the nitrogen source and PhI(OAc)2 as the stoichiometric oxidant and source of acetate. These reactions are highly regio- and diastereoselective, and mechanistic studies reveal that the reaction proceeds via cis-aminopalladation of the alkene followed by oxidative cleavage of the intermediate Pd-C bond with inversion of stereochemistry.