A Protocol To Transform Sulfones into Nitrones and Aldehydes
作者:Eduardo Rodrigo、Inés Alonso、M. Belén Cid
DOI:10.1021/acs.orglett.8b02483
日期:2018.9.21
A simple method to transform sulfones into nitrones and therefore into the corresponding carbonyl derivatives has been developed. Some examples demonstrate that it is a new reliable and versatile reaction in the toolbox of sulfones that has great synthetic potential. NMR and computational studies were used to elucidate the mechanism.
Stereoselective synthesis of (−)-blepharocalyxin D
作者:Haye Min Ko、Dong Gil Lee、Min Ah Kim、Hak Joong Kim、Jaejoon Park、Myoung Soo Lah、Eun Lee
DOI:10.1016/j.tet.2007.02.028
日期:2007.6
The Prinscyclization strategy was successfully applied in the stereoselectivesynthesis of (−)-blepharocalyxin D (1), a cytotoxic dimeric diarylheptanoid isolated from Alpinia blepharocalyx.
The enantiopure total synthesis of (−)-codonopsinine is described using two effective chiron approaches starting either from commercially available l-xylose or from readily available Garner aldehyde. The key steps included Julia trans-olefination, highly diastereoselective alkylation and cascade epoxidation–cyclization strategies.
The enantiopure totalsynthesis of (−)-codonopsinine is described from commercially available l-xylose in 20% overall yield. The key steps included Julia trans olefination and cascade epoxidation–cyclisation strategies.
1]propellane with heteroaryl sulfones acting as difunctional reagents, allowing the introduction of alkyl and heteroaryl units across bicyclo[1.1.1]pentane frameworks. It features a broad substrate scope and can be used to functionalize structurally complex natural products. Mechanistic investigations indicate the Cs2CO3 promoted homolytic cleavage of heteroaryl sulfone C–S bonds by light. Moreover
在这项研究中,我们开发了[1.1.1]丙烷的光诱导双官能化,杂芳基砜作为双官能试剂,允许在双环[1.1.1]戊烷骨架上引入烷基和杂芳基单元。它具有广泛的底物范围,可用于功能化结构复杂的天然产物。机理研究表明Cs 2 CO 3通过光促进杂芳基砜C-S键的均裂。此外,产物中的苯并噻唑基部分可以充当甲酰基前体,这表明由于醛能够进行多种有机转化,因此产物具有强大的可转化性。