α-Diazosulphones and related compounds from the base-induced cleavage of α-diazo-β-ketosulphones
作者:D. Hodson、G. Holt、D. K. Wall
DOI:10.1039/j39680002201
日期:——
sulphonylformaldehyde hydrazones (70—80%), a previously unknown class of compounds, which arose by hydrolysis of the first formed phosphazine. The acylsulphonyldiazomethanes were prepared by the action of toluene-p-sulphonylazide and triethylamine on β-ketosulphones in 60% aqueous ethanol. If the diazoketosulphone is retained in solution and the reaction period prolonged, sulphonylformaldehyde hydrazones may be
[EN] COBALT-CATALYZED ASYMMETRIC CYCLOPROPANATION WITH DIAZOSULFONES<br/>[FR] CYCLOPROPANATION ASYMÉTRIQUE CATALYSÉE PAR COBALT AVEC DES DIAZOSULFONES
申请人:UNIV SOUTH FLORIDA
公开号:WO2009114849A1
公开(公告)日:2009-09-17
Asymmetric cyclopropanation of olefins with diazosulfones.
烯烃与重氮磺酮的不对称环丙烷化反应。
Cobalt-Catalyzed Asymmetric Cyclopropanation with Diazosulfones: Rigidification and Polarization of Ligand Chiral Environment via Hydrogen Bonding and Cyclization
作者:Shifa Zhu、Joshua V. Ruppel、Hongjian Lu、Lukasz Wojtas、X. Peter Zhang
DOI:10.1021/ja7106838
日期:2008.4.1
A new D2-symmetric chiral porphyrin P6 (2,6-DiMeO-ZhuPhyrin) with enhanced chiral rigidity and polarity was designed and synthesized through incorporation of hydrogen bonding and cyclic structure. Its cobalt(II) complex [Co(P6)] is a highly active and selective catalyst for asymmetric cyclopropanation of alkenes with diazosulfones. The [Co(P6)]-based catalytic system is suitable for various aromatic
通过引入氢键和环状结构,设计并合成了一种具有增强手性刚性和极性的新型 D2 对称手性卟啉 P6(2,6-DiMeO-ZhuPhyrin)。其钴 (II) 配合物 [Co(P6)] 是一种高活性和选择性的催化剂,用于烯烃与重氮砜的不对称环丙烷化反应。[Co(P6)]基催化体系适用于各种芳族烯烃以及缺电子烯烃,包括α、β-不饱和酯、酮和腈,在温和的条件下以高产率和高选择性。在大多数情况下,都实现了出色的非对映选择性和对映选择性。
Catalyst-Free Synthesis of Diastereomerically Pure 3-Sulfonylazetidin-2-ones via Microwave-Assisted Tandem Wolff Rearrangement–Staudinger Cycloaddition
Abstract A wide range of α-diazo-β-ketosulfones have been applied to thermally promoted tandem Wolff rearrangement – Staudinger [2+2] cycloaddition with imines to give polysubstituted β-lactam sulfones. Diastereomerically pure syn-diastereomers were obtained in good yields and the relative stereochemistry was confirmed by single-crystal X-ray crystallography. These findings significantly expand the