Synthesis of 2,5-Disubstituted Dihydrofuran-3(2H)-ones via [2,3]-Sigmatropic Rearrangement of Oxonium Ylides Generated from α-Oxo Gold Carbenes
作者:Jinsung Tae、Miyeon Han、Joohee Bae、Juhee Choi
DOI:10.1055/s-0033-1339662
日期:——
oxonium ylides generated from α-oxo gold carbenes were discovered. An efficient synthetic method of 2,5-disubstituted dihydrofuran-3(2H)-ones via gold-catalyzed intermolecular oxidation of the allyl homopropargyl ethers with N-oxide was developed. And the synthetic utility of the current method has been proved by concise formal synthesis of (±)-kumausallene.
Compounds according to Formula I are potent inhibitors of Arginase I and II activity:
where R
1
, R
2
, R
3
, R
4
, D, W, X, Y, and Z are defined in the specification. The invention also provides pharmaceutical compositions of the compounds and methods of their use in treating or preventing a disease or a condition associated with arginase activity.
Compounds according to Formula I are potent inhibitors of Arginase I and II activity:
where R1, R2, R3, R4, D, W, X, Y, and Z are defined in the specification. The invention also provides pharmaceutical compositions of the compounds and methods of their use in treating or preventing a disease or a condition associated with arginase activity.
Rhodium(II)-Catalyzed Stereocontrolled Synthesis of Dihydrofuran-3-imines from 1-Tosyl-1,2,3-triazoles
作者:Alistair Boyer
DOI:10.1021/ol500309x
日期:2014.3.21
Rhodium(II) acetate catalyzes the denitrogenative transformation of 5-substituted and 4,5-disubstituted 1-sulfonyl-1,2,3-triazoles with pendent allyl and propargyl ether motifs to oxonium ylides that undergo [2,3]-sigmatropic rearrangement to give substituted dihydrofuran-3-imines in high yield and diastereoselectivity.
Intramolecular generation and [2,3]-sigmatropic rearrangement of oxonium ylides