Triphenylphosphine-Induced Ring Contraction of 1,2-Dioxines
摘要:
Triphenylphosphine inserts into the peroxide bond of 1,2-dioxines, initiating ring contraction with loss of triphenylphosphine oxide. This process yields dihydrofuran oxides in 54-97% yield from oxirenyl[2,3-c] [1,2]dioxines and dihydrofurans from 3,6-dihydro-1,2-dioxines with inversion of stereochemistry at either the 2 or 5 position in the furan product.
Triphenylphosphine-Induced Ring Contraction of 1,2-Dioxines
摘要:
Triphenylphosphine inserts into the peroxide bond of 1,2-dioxines, initiating ring contraction with loss of triphenylphosphine oxide. This process yields dihydrofuran oxides in 54-97% yield from oxirenyl[2,3-c] [1,2]dioxines and dihydrofurans from 3,6-dihydro-1,2-dioxines with inversion of stereochemistry at either the 2 or 5 position in the furan product.
Design of endoperoxides with anti-Candida activity
作者:Thomas D. Avery、Peter I. Macreadie、Ben W. Greatrex、Tony V. Robinson、Dennis K. Taylor、Ian G. Macreadie
DOI:10.1016/j.bmc.2006.10.021
日期:2007.1.1
Broad antifungal structure-activity relationships governing epoxy-endoperoxides 2 and 3 and their parent endoperoxides I are reported. Their inhibitory activity against Candida albicans in conjunction with hemolytic activity and/or growth inhibition of cultured mammalian cells are reported. This information provided guidance for the further development of endoperoxide and epoxy-endoperoxides as topical antifungal agents. (c) 2006 Elsevier Ltd. All rights reserved.
Triphenylphosphine-Induced Ring Contraction of 1,2-Dioxines
作者:Ben W. Greatrex、Dennis K. Taylor
DOI:10.1021/jo030330c
日期:2004.4.1
Triphenylphosphine inserts into the peroxide bond of 1,2-dioxines, initiating ring contraction with loss of triphenylphosphine oxide. This process yields dihydrofuran oxides in 54-97% yield from oxirenyl[2,3-c] [1,2]dioxines and dihydrofurans from 3,6-dihydro-1,2-dioxines with inversion of stereochemistry at either the 2 or 5 position in the furan product.
Dihydroxylation of 4-Substituted 1,2-Dioxines: A Concise Route to Branched Erythro Sugars
作者:Tony V. Robinson、Daniel Sejer Pedersen、Dennis K. Taylor、Edward R. T. Tiekink
DOI:10.1021/jo900669u
日期:2009.7.17
The synthesis of 2-C-branched erythritol derivatives, including the plant sugar (+/-)-2-C-methylerythritol 2, was achieved through a dihydroxylation/reduction sequence on a series of 4-substituted 1,2-dioxines 3. The asymmetric dihydroxylation of 1,2-dioxines was examined, providing access to optically enriched dihydroxy 1,2-dioxanes 4. The synthesized 1,2-dioxanes were converted to other erythro sugar analogues and tetrahydrofurans through controlled cleavage of the endoperoxide linkage.