Construction of a quaternary carbon at the carbonyl carbon of the cyclohexane ring
作者:Yuki Kaneko、Yohei Kiyotsuka、Hukum P. Acharya、Yuichi Kobayashi
DOI:10.1039/c0cc00653j
日期:——
High S(N)2' selectivity in the allylicsubstitution of cyclohexylidene ethyl picolinates with copper reagents prepared from RMgBr and CuBr.Me(2)S was realized by addition of ZnX(2) (X = I, Br, Cl). Furthermore, ZnX(2) accelerated the reaction with the bulky iPr reagent.
Highly E-selective solvent-free Horner–Wadsworth–Emmons reaction catalyzed by DBU
作者:Kaori Ando、Kyohei Yamada
DOI:10.1039/c1gc15134g
日期:——
The solvent-free Horner–Wadsworth–Emmons reaction of triethylphosphonoacetate with a variety of aldehydes was catalyzed by DBU in the presence of K2CO3 to give E-α,β-unsaturated esters highly selectively (99:1 for most of the reactions). The reaction with ketones gave trisubstituted olefins with good to high E-selectivity by DBU-Cs2CO3.
这 溶剂无Horner–Wadsworth–Emmons的反应 膦酸三乙酯 与各种 醛类DBU在K 2 CO 3的存在下催化得到E -α,β-不饱和酯类高度选择性(大多数反应为99 :1)。与之反应酮类 给出三取代 烯烃DBU-Cs 2 CO 3具有良好的电子选择性,甚至具有很高的电子选择性。
Electrochemically induced fluorinative ring expansion of cycloalkylideneacetates
The electrochemical oxidation of cyclic unsaturated esters (1) was carried out using Et3N-5HF as the electrolyte. The ringexpansion and fluorination took place to give β,β-difluorocycloalkanecarboxylic esters (2) selectively.