Generation of Molecular Complexity from Cyclooctatetraene: Preparation of Aminobicyclo[5.1.0]octitols
作者:Mohamed F. El-Mansy、Matthew Flister、Sergey Lindeman、Kelsey Kalous、Daniel S. Sem、William A. Donaldson
DOI:10.1002/chem.201501274
日期:2015.7.20
yield). The structural assignments of the stereoisomers were established by 1H NMR spectral data as well as X‐ray crystal structures for certain members. The outcomes of several epoxydiol hydrolyses, particularly ring contraction and enlargement, are of note. The isomeric phthalimides as well as the free amines did not exhibit β‐glucosidase inhibitory activity at a concentration of less than 100 μM.
从N-(双环[5.1.0] octa-3,5-dien- N-(双环[5.1.0] octa-3,5-dien-)从一到四个步骤制备了一系列八种立体异构N-(四羟基双环[5.1.0] oct-2 S *-基)邻苯二甲酰亚胺。2-基)邻苯二甲酰亚胺(±)-7,可从环辛酸酯中轻松获得(62%收率)。立体异构体的结构分配是通过1 H NMR光谱数据以及某些成员的X射线晶体结构确定的。值得注意的是几种环氧二醇水解的结果,尤其是环的收缩和扩大。浓度低于100μM时,异构的邻苯二甲酰亚胺和游离胺均未表现出β-葡萄糖苷酶抑制活性。
Cycloaddition reactions of phthalimide substituted cyclic polyenes with heteroatom dienophiles
作者:Stephen S. Templin、Nathaniel J. Wallock、Daniel T. Haworth、William A. Donaldson、Dennis W. Bennett、Tasneem Siddiquee
DOI:10.1002/jhet.5570440334
日期:2007.5
The cycloaddition of 6-phthalimidobicyclo[5.1.0]octa-2,4-diene and 7-phthalimido-1,3,5-cycloheptatriene with nitrosobenzene and with 4-phenyl-1,2,4-triazoline-3,5-dione each gave a single heterocyclic product. X-ray crystallographic analysis of 8a indicated the regio- and stereoselectivity of this cycloaddition.
Synthesis of cyclopropanes via organoiron methodology: stereoselective preparation of cis-2-(2′-carboxycyclopropyl)glycine
作者:Nathaniel J Wallock、William A Donaldson
DOI:10.1016/s0040-4039(02)00804-3
日期:2002.6
exo-Nucleophilic addition to the (bicyclo[5.1.0]octadienyl)iron(1+) cation establishes the relative stereochemistry at the cyclopropanering and the α-stereocenter. Subsequent removal of the metal and cleavage of the cyclic diene gave the protected target 10, which upon hydrolysis gave 1.
Reactivity of (Bicyclo[5.1.0]octadienyl)iron(1+) Cations: Application to the Synthesis of <i>cis</i>-2-(2‘-Carboxycyclopropyl)glycines
作者:Nathaniel J. Wallock、William A. Donaldson
DOI:10.1021/jo030259a
日期:2004.4.1
heteroatom nucleophiles to (bicyclo[5.1.0]octadienyl)Fe(CO)2L+ cations 5 or 8 (L = CO, PPh3) generally proceeds via attack at the dienyl terminus on the face of the ligand opposite to iron to generate 6-substituted (bicyclo[5.1.0]octa-2,4-diene)ironcomplexes (11 or 13). In certain cases, these products are unstable with respect to elimination of a proton and the nucleophilic substituent to afford (cyclooctatetraene)Fe(CO)2L