Direct Catalytic Synthesis of Unprotected 2-Amino-1-Phenylethanols from Alkenes by Using Iron(II) Phthalocyanine
作者:Luca Legnani、Bill Morandi
DOI:10.1002/anie.201507630
日期:2016.2.5
medicinal chemistry and natural products. Herein, we report that an exceptionally simple and inexpensive FeII complex efficiently catalyzes the direct transformation of simple alkenes into unprotected amino alcohols in good yield and perfect regioselectivity. This new catalytic method was applied in the expedientsynthesis of bioactive molecules and could be extended to aminoetherification.
Enantioselective Scandium-Catalyzed Vinylsilane Additions: A New Approach to the Synthesis of Enantiopure β,γ-Unsaturated α-Hydroxy Acid Derivatives
作者:David A. Evans、Yimon Aye
DOI:10.1021/ja063878k
日期:2006.8.1
The development of the Lewis acid-catalyzed alkenylation using trimethylvinylsilanes is described. Both aliphatic and aromatic vinylsilanes were effective nucleophiles at room temperature affording chiral allylic alcohol products in excellent enantioselectivities (97 → 99% ee) and in moderate to good yields (45−99%). Complete retention of vinysilane geometry was observed where applicable.
From Carbodiimides to Carbon Dioxide: Quantification of the Electrophilic Reactivities of Heteroallenes
作者:Zhen Li、Robert J. Mayer、Armin R. Ofial、Herbert Mayr
DOI:10.1021/jacs.0c01960
日期:2020.5.6
isothiocyanates, carbodiimides, carbon disulfide, and carbon dioxide with carbanions or enamines (reference nucleophiles) have been measured photometrically in acetonitrile or DMSO solution at 20 °C. The resulting second-order rate constants and the previously published reactivity parameters N and sN of the reference nucleophiles were substituted into the correlation log k2(20 °C) = sN(N + E) to determine the
异氰酸酯、异硫氰酸酯、碳二亚胺、二硫化碳和二氧化碳与碳负离子或烯胺(参考亲核试剂)的反应动力学已在 20 °C 下在乙腈或 DMSO 溶液中进行光度测量。将所得的二阶速率常数和先前公布的参考亲核试剂的反应性参数 N 和 sN 代入相关性 log k2(20 °C) = sN(N + E) 以确定杂烯的亲电性参数:TsNCO ( E = -7.69) ≫ PhNCO (E = -15.38) > CS2 (E = -17.70) ≈ PhNCS (E = -18.15) > PhNCNPh (E = -20.14) ≫ CyNCNCy (E ≈ -30)。可以推导出 CO2 的近似值 (-16 < E < - 11)。量子化学计算在 IEFPCM(DMSO)/B3LYP-D3/6-311+G(d, p) 理论水平并与实验吉布斯激活能进行比较。畸变相互作用模型用于合理化 O-和 S-取代的杂丙
Metal promoted cyclization. 18. Novel cyclialkylation reactions of (.omega.-halo-1-alkenyl)metal derivatives. Synthetic scope and mechanism
作者:Eiichi. Negishi、Larry D. Boardman、Hiroyuki. Sawada、Vahid. Bagheri、A. Timothy. Stoll、James M. Tour、Cynthia L. Rand
DOI:10.1021/ja00224a025
日期:1988.8
Cyclisation d'(ω-halogenoalcene-1yl) M et d'([ω-halogeno trimethylsilyl-1] alcene-1yl) M en cyclenes (M=aluminium, zinc, zirconium, ou silicium)
环化 d'(ω-halogenoalcene-1yl) M et d'([ω-halogeno trimethylsilyl-1] alcene-1yl) M 环烯(M = 铝、锌、锆、硅)
Direct coupling of alcohols with alkenylsilanes catalyzed by indium trichloride or bismuth tribromide
作者:Yoshihiro Nishimoto、Masayuki Kajioka、Takahiro Saito、Makoto Yasuda、Akio Baba
DOI:10.1039/b816072d
日期:——
Indium halides or bismuth halides catalyzed the coupling of various alcohols with alkenylsilanes to give the corresponding alkenes stereospecifically without any other activators.