Pd-catalyzed asymmetric allylicalkylation reactions of acyclicketones with monosubstituted allyl substrates using 1,1‘-P,N-ferrocene with H as substituent on the oxazoline ring as ligand gave products having two chiral centers with high yields and with high regio-, diastereo-, and enantioselectivities, with the ratio of branched and linear products being 98:2, anti:syn ratio for branched products
Pd 催化无环酮与单取代烯丙基底物的不对称烯丙基烷基化反应,使用 1,1'-P,N-二茂铁,H 作为恶唑啉环上的取代基作为配体,得到具有两个手性中心的高产率和高区域-,非对映选择性和对映选择性,支链和线性产物的比例为 98:2,支链产物的反:syn 比例为 7-21:1,反产物的 ee 为 92-99%。
A One-Pot Palladium-Catalyzed Allylic Alkylation and Wittig Reaction of Phosphorus Ylides
作者:Wen-Bo Liu、Hu He、Li-Xin Dai、Shu-Li You
DOI:10.1002/chem.201000316
日期:2010.7.5
Put a(n) (y)lid(e) on it! The one‐pot palladium‐catalyzed allylic alkylation and Wittigreaction of phosphorus ylides with various aldehydes and ketenes has been realized, which produce skipped dienes, including trisubstituted alkenes and tetrasubstituted allenes, respectively (see scheme), in moderate to good overall yields.
An Ir-catalyzed asymmetric allylic alkylation using chiral diaminophosphine oxide is described. Asymmetric allylic alkylation of terminal allylic carbonates proceeded using 5 mol % of Ir catalyst, 5 mol % of DIAPHOX 1i, 10 mol % of NaPF6, 10 mol % of LiOAc, and N,O-bis(trimethylsilyl)acetamide (BSA), affording the corresponding branched products in excellent yield and in up to 95% ee. The developed
Ir-Catalyzed Regio- and Enantioselective Friedel–Crafts-Type Allylic Alkylation of Indoles
作者:Wen-Bo Liu、Hu He、Li-Xin Dai、Shu-Li You
DOI:10.1021/ol800409d
日期:2008.5.1
Highly regio- and enantioselective Ir-catalyzed Friedel-Crafts type allylic alkylation of indoles have been realized using [Ir(COD)Cl]2/phosphoramidite ligand 1a, affording the branched products with up to >97/3 branched-linear ratio and 92% ee.
Synthesis of allylic sulfonic acids via regioselective Pd-catalyzed allylic substitutions of Na 2 SO 3
作者:Wei Liu、Xiaoming Zhao
DOI:10.1016/j.tetlet.2015.10.077
日期:2015.12
Palladium-catalyzed allylic sulfonations of the linear allylic carbonates with sodium sulfite (Na2SO3) were accomplished under mild conditions. This method gave allylic sulfonic acids in good to excellent yields with high level of regioselectivities. (C) 2015 Elsevier Ltd. All rights reserved.