An expedient synthesis of 2,4,5-trisubstituted 1,4-pentadienes from Baylis–Hillman adducts via the Pd-catalyzed decarboxylation–elimination protocol
摘要:
We disclosed an efficient synthetic method of 2,4,5-trisubstituted 1,4-pentadienes from Baylis-Hillman adducts via the Pd-catalyzed decarboxylation-elimination protocol as the key step. (C) 2009 Elsevier Ltd. All rights reserved.
Preparation of N-protected allylic amines and α-methylene-β-amino acids from vinylalumination/Baylis–Hillman products via tandem SN2′ substitution–Overman rearrangement
作者:P. Veeraraghavan Ramachandran、Thomas E. Burghardt、M. Venkat Ram Reddy
DOI:10.1016/j.tetlet.2005.01.110
日期:2005.3
reaction on the acetates obtained from vinylalumination or Baylis–Hillman products, followed by in situ reduction afforded allylicalcohols. Upon conversion to trichloroacetimidates and [3,3]-sigmatropic rearrangement, the corresponding N-protected β-substituted allylic amines were obtained in good yields. Utilization of hydroxy group as the nucleophile furnished allylic hydroxy esters, which were converted
S N 2'对由乙烯基铝化或Baylis-Hillman产品获得的乙酸盐进行反应,然后原位还原得到烯丙醇。在转化为三氯乙亚氨酸酯和[3,3]-σ重排后,以良好的产率获得了相应的N-保护的β-取代的烯丙基胺。利用羟基作为亲核试剂提供的烯丙基羟基酯,其通过超人重排转化为受保护的α-亚甲基-β-氨基酸。
Synthesis of stereochemically defined (E)-cinnamyl alcohol derivatives from the Baylis–Hillman adducts
作者:Hyoung Shik Kim、Tae Yi Kim、Ka Young Lee、Yun Mi Chung、Hong Jung Lee、Jae Nyoung Kim
DOI:10.1016/s0040-4039(00)00229-x
日期:2000.4
The reaction of the Baylis–Hillman adducts 1a–g and trifluoroacetic acid at 30–70°C gave the rearranged cinnamyl alcohols 2a–g stereoselectively in moderate yields.
Asymmetric chemo- and regiospecific addition of organozinc reagents to Baylis–Hillman derived allylic electrophiles
作者:Christoph Börner、Paul J. Goldsmith、Simon Woodward、Josep Gimeno、Serafino Gladiali、Daniela Ramazzotti
DOI:10.1039/b006943o
日期:——
The copper-catalysed SN2â² addition of
ZnR2 to allylic
(Z)-ArCHC(CH2X)(CO2Et) (X = Br, Cl,
OSO2Me) fashions only
ArCH(R)C(CH2)(CO2Et); use of a chiral ligand
gives up to 64% ee for this demanding reaction.
FeCl<sub>3</sub>and Yb(OTf)<sub>3</sub>Mediated Conversion of Acetates of the Baylis–Hillman Adducts into (Z) and (E) Trisubstituted Alkenes
作者:Palakodety Radha Krishna、V. Kannan、G. V. M. Sharma
DOI:10.1081/scc-120027238
日期:2004.12.31
Abstract Anhydrous FeCl3 and Yb(OTf)3 are utilised as new reagents for the stereoselective isomerisation of acetates of the Baylis–Hillmanadducts to both (Z) and (E) trisubstitutedalkenes respectively.
Combining NHC-Cu and Brønsted Base Catalysis: Enantioselective Allylic Substitution/Conjugate Additions with Alkynylaluminum Reagents and Stereospecific Isomerization of the Products to Trisubstituted Allenes
作者:Jennifer A. Dabrowski、Fredrik Haeffner、Amir H. Hoveyda
DOI:10.1002/anie.201303501
日期:2013.7.22
All‐catalytic route to trisubstituted allenes: The first examples of catalytic enantioselective allylic substitutionreactions that involve alkyne‐based nucleophiles and lead to products having tertiary stereogenic centers are followed by an exceptionally stereospecific amine‐catalyzed isomerization to trisubstituted allenes (see picture; NHC=N‐heterocyclic carbene).