Asymmetric Enzymatic Synthesis of Allylic Amines: A Sigmatropic Rearrangement Strategy
作者:Christopher K. Prier、Todd K. Hyster、Christopher C. Farwell、Audrey Huang、Frances H. Arnold
DOI:10.1002/anie.201601056
日期:2016.4.4
Sigmatropic rearrangements, while rare in biology, offer opportunities for the efficient and selective synthesis of complex chemical motifs. A “P411” serine‐ligated variant of cytochrome P450BM3 has been engineered to initiate a sulfimidation/[2,3]‐sigmatropic rearrangement sequence in whole E. coli cells, a non‐natural function for any enzyme, providing access to enantioenriched, protected allylic amines
作者:Piotr Aleksandrowicz、Hanna Piotrowska、Wojciech Sas
DOI:10.1016/0040-4020(82)85120-x
日期:1982.1
study of palladium catalyzed C-allylation of aliphatic nitrocompounds is described. Allylic alcohols and/or their acetates and allyl phenyl ethers were employed as allylating agents. The dependence of the reaction yield on nature and quantity of base and structure of the allylic unit is reported and explained. The lowest yield was obtained for allyl alcohol; however it could be considerably increased
Enantioselective Synthesis of α-Allyl Amino Esters via Hydrogen-Bond-Donor Catalysis
作者:Andrew J. Bendelsmith、Seohyun Chris Kim、Masayuki Wasa、Stéphane P. Roche、Eric N. Jacobsen
DOI:10.1021/jacs.9b05556
日期:2019.7.24
diastereoselec-tive synthesis of α-allyl amino esters. The optimized protocol provides access to N-carbamoyl-protected amino esters via nucleophilic allyla-tion of readily accessible α-chloro glycinates. A variety of useful α-allyl amino esters were prepared-including crotylated products bearing vicinal stereocenters that are inaccessible through enolate alkylation-with high enantioselectivity (up to 97% ee)
Diastereoselective Ireland–Claisen rearrangements of substituted allyl β-amino esters: applications in the asymmetric synthesis of C(5)-substituted transpentacins
作者:Stephen G. Davies、Ai M. Fletcher、James A. Lee、Paul M. Roberts、Myriam Y. Souleymanou、James E. Thomson、Charlotte M. Zammit
DOI:10.1039/c4ob00274a
日期:——
The diastereoselective Ireland–Claisen rearrangement of a range of substituted allyl β-amino esters gave the corresponding enantiopure α-substituted-β-amino esters with good diastereoselectivity. The application of this methodology in the asymmetric synthesis of a range of C(5)-substituted 1,2-anti-1,5-syn-transpentacins was demonstrated by the rearrangement of a range of β-amino esters derived from
Pentane-2,4-dione with allylic alcohols or benzyl alcohol with palladium catalysts gives high yields of C-monoalkylated diketones, arising mainly from reaction at the terminal end of the allyic system for alkyl monosubstituted allyl alcohols. The effect of the catalyst on the alcohols has been evaluated; rearrangements and disproportionations have been observed.