The Endocyclic Restriction Test: Oxygen Transfer from N-Sulfonyl Oxaziridines to Alkenes
摘要:
[GRAPHICS]The transition state for the transfer of oxygen from N-sulfonyl oxaziridines to alkenes has been investigated experimentally using the endocyclic restriction test. Molecules containing oxaziridines and alkenes were prepared and the ability of each system to intramolecularly transfer oxygen was evaluated, The results are consistent with a transition state in which N-O bond cleavage is more advanced than C-O bond cleavage.
The Endocyclic Restriction Test: Oxygen Transfer from N-Sulfonyl Oxaziridines to Alkenes
摘要:
[GRAPHICS]The transition state for the transfer of oxygen from N-sulfonyl oxaziridines to alkenes has been investigated experimentally using the endocyclic restriction test. Molecules containing oxaziridines and alkenes were prepared and the ability of each system to intramolecularly transfer oxygen was evaluated, The results are consistent with a transition state in which N-O bond cleavage is more advanced than C-O bond cleavage.
An enantioselective intramolecular oxidative cyclization of 4-alkenoic acids was developed. The reaction proceeded via a π-allyl Pd intermediate generated by an allylic C–H activation to give γ-lactone derivatives with moderate to good enantioselectivity. Spiro bis(isoxazoline) ligand, SPRIX, was indispensable for this asymmetric transformation.
Studies dealing with the intramolecular ene reaction of cyclopropene derivatives
作者:Albert Padwa、William F. Rieker、Robert J. Rosenthal
DOI:10.1021/ja00292a042
日期:1985.3
On etudie le comportement thermique et photochimique d'une serie de l'o-alcenylphenyl-3 cyclopropenes substitues. La pyrolyse de l'o-propenylphenyl-3 cyclopropene substitue trans conduit au cycloadduit [2+2] alors que l'isomere cis subit une reaction ene
在研究 le comportement thermique et photochimique d'une serie de l'o-alcenylphenyl-3 cyclopropenes substitues。La 热解 l'o-propenylphenyl-3 cyclopropene substitue trans导管 au cycloadduit [2+2] alors que l'isomere cis subitune 反应烯
Direct Access to Primary Amines from Alkenes by Selective Metal‐Free Hydroamination
作者:Yi‐Dan Du、Bi‐Hong Chen、Wei Shu
DOI:10.1002/anie.202016679
日期:2021.4.26
selective synthesis of primary aminesfrom easily available precursors is attractive yet challenging. Herein, we report the rapid synthesis of primary aminesfrom alkenes via metal‐free regioselective hydroamination at room temperature. Ammonium carbonate was used as ammonia surrogate for the first time, allowing for efficient conversion of terminal and internal alkenes into linear, α‐branched, and α‐tertiary
Catalytic, Diastereoselective 1,2-Difluorination of Alkenes
作者:Steven M. Banik、Jonathan William Medley、Eric N. Jacobsen
DOI:10.1021/jacs.6b02391
日期:2016.4.20
with all types of substitution patterns. In general, the vicinal difluoride products are produced with high diastereoselectivities. The observed sense of stereoinduction implicates anchimericassistance pathways in reactions of alkenes bearing neighboring Lewis basic functionality.
Intramolecular Crossed [2+2] Photocycloaddition through Visible Light-Induced Energy Transfer
作者:Jiannan Zhao、Jonathan L. Brosmer、Qingxuan Tang、Zhongyue Yang、K. N. Houk、Paula L. Diaconescu、Ohyun Kwon
DOI:10.1021/jacs.7b05277
日期:2017.7.26
Herein, we present the intramolecular [2+2] cycloadditions of dienones promoted through sensitization, using a polypyridyl iridium(III) catalyst, to form bridged cyclobutanes. In contrast to previous examples of straight [2+2] cycloadditions, these efficient crossed additions were achieved under irradiation with visible light. The reactions delivered desired bridged benzobicycloheptanone products with